diff --git a/components/modal/__tests__/modal-920.spec.ts b/components/modal/__tests__/modal-920.spec.ts
new file mode 100644
index 000000000..fd1520521
--- /dev/null
+++ b/components/modal/__tests__/modal-920.spec.ts
@@ -0,0 +1,43 @@
+import { mount } from '@vue/test-utils';
+import { nextTick } from 'vue';
+import { describe, expect, it } from 'vitest';
+import FModal from '../modal';
+import fs from 'fs';
+import path from 'path';
+
+describe('modal-920: word-break fix', () => {
+    it('less file should contain overflow hidden and word-break break-word', () => {
+        const lessFilePath = path.resolve(__dirname, '../style/index.less');
+        const lessContent = fs.readFileSync(lessFilePath, 'utf-8');
+
+        expect(lessContent).toContain('overflow: hidden');
+        expect(lessContent).toContain('word-break: break-word');
+
+        expect(lessContent).toMatch(/\.@{modal-prefix-cls}-wrapper[\s\S]*?overflow:\s*hidden/);
+        expect(lessContent).toMatch(/\.@{modal-prefix-cls}-body[\s\S]*?word-break:\s*break-word/);
+    });
+
+    it('FModal with long-no-space string should render without error and have word-break style', async () => {
+        const longText = '这是一段非常长的没有任何空格的文字用于测试wordbreak是否生效这只股票代码是SH600000SH600000SH600000SH600000SH600000SH600000';
+
+        const wrapper = mount(FModal, {
+            attachTo: document.body,
+            props: {
+                show: true,
+                title: '测试长文字',
+            },
+            slots: {
+                default: () => longText,
+            },
+        });
+
+        await nextTick();
+        await new Promise(resolve => setTimeout(resolve, 500));
+
+        const modalBodyEl = document.body.querySelector('.fes-modal-body');
+        expect(modalBodyEl).not.toBeNull();
+        expect(modalBodyEl?.textContent).toContain(longText);
+
+        wrapper.unmount();
+    });
+});
\ No newline at end of file
diff --git a/components/modal/style/index.less b/components/modal/style/index.less
index 2171748ce..22a4fd6b4 100644
--- a/components/modal/style/index.less
+++ b/components/modal/style/index.less
@@ -81,6 +81,7 @@
         background: var(--f-body-bg-color);
         border-radius: var(--f-border-radius-base);
         box-shadow: @shadow-down;
+        overflow: hidden;
     }
 
     &-header {
@@ -130,6 +131,7 @@
         padding: @padding-xs 0;
         color: var(--f-sub-head-color);
         font-size: var(--f-font-size-base);
+        word-break: break-word;
     }
 
     &-footer {