diff --git a/packages/roosterjs-content-model-dom/lib/config/defaultContentModelFormatMap.ts b/packages/roosterjs-content-model-dom/lib/config/defaultContentModelFormatMap.ts
index 4576d1bc708..b686d5144cf 100644
--- a/packages/roosterjs-content-model-dom/lib/config/defaultContentModelFormatMap.ts
+++ b/packages/roosterjs-content-model-dom/lib/config/defaultContentModelFormatMap.ts
@@ -52,4 +52,7 @@ export const defaultContentModelFormatMap: DefaultImplicitFormatMap = {
         marginTop: '1em',
         marginBottom: '1em',
     },
+    th: {
+        fontWeight: 'bold',
+    },
 };
diff --git a/packages/roosterjs-content-model-dom/lib/config/defaultHTMLStyleMap.ts b/packages/roosterjs-content-model-dom/lib/config/defaultHTMLStyleMap.ts
index 5ee760791ee..f8d911cf198 100644
--- a/packages/roosterjs-content-model-dom/lib/config/defaultHTMLStyleMap.ts
+++ b/packages/roosterjs-content-model-dom/lib/config/defaultHTMLStyleMap.ts
@@ -117,6 +117,7 @@ export const defaultHTMLStyleMap: DefaultStyleMap = {
     },
     th: {
         display: 'table-cell',
+        fontWeight: 'bold',
     },
     u: {
         textDecoration: 'underline',
diff --git a/packages/roosterjs-content-model-dom/lib/modelApi/editing/applyTableFormat.ts b/packages/roosterjs-content-model-dom/lib/modelApi/editing/applyTableFormat.ts
index 942a638fe91..25d1ea35c3f 100644
--- a/packages/roosterjs-content-model-dom/lib/modelApi/editing/applyTableFormat.ts
+++ b/packages/roosterjs-content-model-dom/lib/modelApi/editing/applyTableFormat.ts
@@ -262,6 +262,10 @@ export function setFirstColumnFormatBorders(
                 switch (rowIndex) {
                     case 0:
                         cell.isHeader = !!format.hasHeaderRow;
+
+                        if (cell.isHeader) {
+                            cell.format.fontWeight = 'bold';
+                        }
                         break;
                     case rows.length - 1:
                         setBorderColor(cell.format, 'borderTop');
@@ -295,6 +299,7 @@ function setHeaderRowFormat(
         const cell = mutateBlock(readonlyCell);
 
         cell.isHeader = true;
+        cell.format.fontWeight = 'bold';
 
         if (format.headerRowColor) {
             if (!metaOverrides.bgColorOverrides[rowIndex][cellIndex]) {
diff --git a/packages/roosterjs-content-model-dom/lib/modelToDom/handlers/handleTable.ts b/packages/roosterjs-content-model-dom/lib/modelToDom/handlers/handleTable.ts
index 5f564971b79..2f183cf580b 100644
--- a/packages/roosterjs-content-model-dom/lib/modelToDom/handlers/handleTable.ts
+++ b/packages/roosterjs-content-model-dom/lib/modelToDom/handlers/handleTable.ts
@@ -3,6 +3,7 @@ import { hasMetadata } from '../../modelApi/metadata/updateMetadata';
 import { isBlockEmpty } from '../../modelApi/common/isEmpty';
 import { moveChildNodes } from '../../domUtils/moveChildNodes';
 import { reuseCachedElement } from '../../domUtils/reuseCachedElement';
+import { stackFormat } from '../utils/stackFormat';
 import type {
     ContentModelBlockHandler,
     ContentModelTable,
@@ -96,9 +97,9 @@ export const handleTable: ContentModelBlockHandler<ContentModelTable> = (
             }
 
             if (!cell.spanAbove && !cell.spanLeft) {
+                const tag = cell.isHeader ? 'th' : 'td';
                 const td =
-                    (context.allowCacheElement && cell.cachedElement) ||
-                    doc.createElement(cell.isHeader ? 'th' : 'td');
+                    (context.allowCacheElement && cell.cachedElement) || doc.createElement(tag);
 
                 tr.appendChild(td);
 
@@ -132,18 +133,25 @@ export const handleTable: ContentModelBlockHandler<ContentModelTable> = (
                     }
                 }
 
-                if (!cell.cachedElement) {
-                    if (context.allowCacheElement) {
-                        cell.cachedElement = td;
+                stackFormat(context, tag, () => {
+                    if (!cell.cachedElement) {
+                        if (context.allowCacheElement) {
+                            cell.cachedElement = td;
+                        }
+
+                        applyFormat(td, context.formatAppliers.block, cell.format, context);
+                        applyFormat(td, context.formatAppliers.tableCell, cell.format, context);
+                        applyFormat(
+                            td,
+                            context.formatAppliers.tableCellBorder,
+                            cell.format,
+                            context
+                        );
+                        applyFormat(td, context.formatAppliers.dataset, cell.dataset, context);
                     }
 
-                    applyFormat(td, context.formatAppliers.block, cell.format, context);
-                    applyFormat(td, context.formatAppliers.tableCell, cell.format, context);
-                    applyFormat(td, context.formatAppliers.tableCellBorder, cell.format, context);
-                    applyFormat(td, context.formatAppliers.dataset, cell.dataset, context);
-                }
-
-                context.modelHandlers.blockGroupChildren(doc, td, cell, context);
+                    context.modelHandlers.blockGroupChildren(doc, td, cell, context);
+                });
 
                 context.onNodeCreated?.(cell, td);
             }
diff --git a/packages/roosterjs-content-model-dom/test/endToEndTest.ts b/packages/roosterjs-content-model-dom/test/endToEndTest.ts
index 1313bb9918e..3d07f2a9972 100644
--- a/packages/roosterjs-content-model-dom/test/endToEndTest.ts
+++ b/packages/roosterjs-content-model-dom/test/endToEndTest.ts
@@ -2226,4 +2226,157 @@ describe('End to end test for DOM => Model => DOM/TEXT', () => {
             '<div style="text-align: center;">test</div>'
         );
     });
+
+    it('TH without font-weight', () => {
+        runTest(
+            '<table><tr><th>test</th></tr></table>',
+            {
+                blockGroupType: 'Document',
+                blocks: [
+                    {
+                        widths: [],
+                        rows: [
+                            {
+                                height: 0,
+                                cells: [
+                                    {
+                                        spanAbove: false,
+                                        spanLeft: false,
+                                        isHeader: true,
+                                        blockGroupType: 'TableCell',
+                                        blocks: [
+                                            {
+                                                isImplicit: true,
+                                                segments: [
+                                                    {
+                                                        text: 'test',
+                                                        segmentType: 'Text',
+                                                        format: {
+                                                            fontWeight: 'bold',
+                                                        },
+                                                    },
+                                                ],
+                                                blockType: 'Paragraph',
+                                                format: {},
+                                            },
+                                        ],
+                                        format: {},
+                                        dataset: {},
+                                    },
+                                ],
+                                format: {},
+                            },
+                        ],
+                        blockType: 'Table',
+                        format: {},
+                        dataset: {},
+                    },
+                ],
+            },
+            'test',
+            '<table><tbody><tr><th>test</th></tr></tbody></table>'
+        );
+    });
+
+    it('TH with font-weight: 400', () => {
+        runTest(
+            '<table><tr><th style="font-weight:400">test</th></tr></table>',
+            {
+                blockGroupType: 'Document',
+                blocks: [
+                    {
+                        widths: [],
+                        rows: [
+                            {
+                                height: 0,
+                                cells: [
+                                    {
+                                        spanAbove: false,
+                                        spanLeft: false,
+                                        isHeader: true,
+                                        blockGroupType: 'TableCell',
+                                        blocks: [
+                                            {
+                                                isImplicit: true,
+                                                segments: [
+                                                    {
+                                                        text: 'test',
+                                                        segmentType: 'Text',
+                                                        format: {
+                                                            fontWeight: '400',
+                                                        },
+                                                    },
+                                                ],
+                                                blockType: 'Paragraph',
+                                                format: {},
+                                            },
+                                        ],
+                                        format: {},
+                                        dataset: {},
+                                    },
+                                ],
+                                format: {},
+                            },
+                        ],
+                        blockType: 'Table',
+                        format: {},
+                        dataset: {},
+                    },
+                ],
+            },
+            'test',
+            '<table><tbody><tr><th><span style="font-weight: 400;">test</span></th></tr></tbody></table>'
+        );
+    });
+
+    it('TH with font-weight: bold', () => {
+        runTest(
+            '<table><tr><th style="font-weight: bold">test</th></tr></table>',
+            {
+                blockGroupType: 'Document',
+                blocks: [
+                    {
+                        widths: [],
+                        rows: [
+                            {
+                                height: 0,
+                                cells: [
+                                    {
+                                        spanAbove: false,
+                                        spanLeft: false,
+                                        isHeader: true,
+                                        blockGroupType: 'TableCell',
+                                        blocks: [
+                                            {
+                                                isImplicit: true,
+                                                segments: [
+                                                    {
+                                                        text: 'test',
+                                                        segmentType: 'Text',
+                                                        format: {
+                                                            fontWeight: 'bold',
+                                                        },
+                                                    },
+                                                ],
+                                                blockType: 'Paragraph',
+                                                format: {},
+                                            },
+                                        ],
+                                        format: {},
+                                        dataset: {},
+                                    },
+                                ],
+                                format: {},
+                            },
+                        ],
+                        blockType: 'Table',
+                        format: {},
+                        dataset: {},
+                    },
+                ],
+            },
+            'test',
+            '<table><tbody><tr><th>test</th></tr></tbody></table>'
+        );
+    });
 });
diff --git a/packages/roosterjs-content-model-types/lib/contentModel/format/ContentModelTableCellFormat.ts b/packages/roosterjs-content-model-types/lib/contentModel/format/ContentModelTableCellFormat.ts
index 651535c95f0..3640a14efe0 100644
--- a/packages/roosterjs-content-model-types/lib/contentModel/format/ContentModelTableCellFormat.ts
+++ b/packages/roosterjs-content-model-types/lib/contentModel/format/ContentModelTableCellFormat.ts
@@ -1,3 +1,4 @@
+import type { BoldFormat } from './formatParts/BoldFormat';
 import type { BorderBoxFormat } from './formatParts/BorderBoxFormat';
 import type { ContentModelBlockFormat } from './ContentModelBlockFormat';
 import type { SizeFormat } from './formatParts/SizeFormat';
@@ -13,4 +14,5 @@ export type ContentModelTableCellFormat = ContentModelBlockFormat &
     VerticalAlignFormat &
     WordBreakFormat &
     TextColorFormat &
-    SizeFormat;
+    SizeFormat &
+    BoldFormat;