diff --git a/dlls/msxml3/cdata.c b/dlls/msxml3/cdata.c
index 21c84335076..38a429e6db8 100644
--- a/dlls/msxml3/cdata.c
+++ b/dlls/msxml3/cdata.c
@@ -539,8 +539,45 @@ static HRESULT WINAPI domcdata_substringData(
     IXMLDOMCDATASection *iface,
     long offset, long count, BSTR *p)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    domcdata *This = impl_from_IXMLDOMCDATASection( iface );
+    xmlnode *pDOMNode = impl_from_IXMLDOMNode( (IXMLDOMNode*)This->element );
+    xmlChar *pContent;
+    long nLength = 0;
+    HRESULT hr = S_FALSE;
+
+    TRACE("%p\n", iface);
+
+    if(!p)
+        return E_INVALIDARG;
+
+    *p = NULL;
+    if(offset < 0 || count < 0)
+        return E_INVALIDARG;
+
+    if(count == 0)
+        return hr;
+
+    pContent = xmlNodeGetContent(pDOMNode->node);
+    if(pContent)
+    {
+        nLength = xmlStrlen(pContent);
+
+        if( offset < nLength)
+        {
+            BSTR sContent = bstr_from_xmlChar(pContent);
+            if(offset + count > nLength)
+                *p = SysAllocString(&sContent[offset]);
+            else
+                *p = SysAllocStringLen(&sContent[offset], count);
+
+            SysFreeString(sContent);
+            hr = S_OK;
+        }
+
+        xmlFree(pContent);
+    }
+
+    return hr;
 }
 
 static HRESULT WINAPI domcdata_appendData(
diff --git a/dlls/msxml3/tests/domdoc.c b/dlls/msxml3/tests/domdoc.c
index dc94c1370a5..a503d79803b 100644
--- a/dlls/msxml3/tests/domdoc.c
+++ b/dlls/msxml3/tests/domdoc.c
@@ -2454,6 +2454,52 @@ static void test_xmlTypes(void)
                 ok( !lstrcmpW( str, _bstr_("This &is a ; test <>\\") ), "incorrect text string\n");
                 SysFreeString(str);
 
+                /* test substringData */
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, 0, 4, NULL);
+                ok(hr == E_INVALIDARG, "ret %08x\n", hr );
+
+                /* test substringData - Invalid offset */
+                str = (BSTR)&szElement;
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, -1, 4, &str);
+                ok(hr == E_INVALIDARG, "ret %08x\n", hr );
+                ok( str == NULL, "incorrect string\n");
+
+                /* test substringData - Invalid offset */
+                str = (BSTR)&szElement;
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, 30, 0, &str);
+                ok(hr == S_FALSE, "ret %08x\n", hr );
+                ok( str == NULL, "incorrect string\n");
+
+                /* test substringData - Invalid size */
+                str = (BSTR)&szElement;
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, 0, -1, &str);
+                ok(hr == E_INVALIDARG, "ret %08x\n", hr );
+                ok( str == NULL, "incorrect string\n");
+
+                /* test substringData - Invalid size */
+                str = (BSTR)&szElement;
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, 2, 0, &str);
+                ok(hr == S_FALSE, "ret %08x\n", hr );
+                ok( str == NULL, "incorrect string\n");
+
+                /* test substringData - Start of string */
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, 0, 4, &str);
+                ok(hr == S_OK, "ret %08x\n", hr );
+                ok( !lstrcmpW( str, _bstr_("This") ), "incorrect substringData string\n");
+                SysFreeString(str);
+
+                /* test substringData - Middle of string */
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, 13, 4, &str);
+                ok(hr == S_OK, "ret %08x\n", hr );
+                ok( !lstrcmpW( str, _bstr_("test") ), "incorrect substringData string\n");
+                SysFreeString(str);
+
+                /* test substringData - End of string */
+                hr = IXMLDOMCDATASection_substringData(pCDataSec, 20, 4, &str);
+                ok(hr == S_OK, "ret %08x\n", hr );
+                ok( !lstrcmpW( str, _bstr_("\\") ), "incorrect substringData string\n");
+                SysFreeString(str);
+
                 IXMLDOMCDATASection_Release(pCDataSec);
             }