最后我解决了问题，如 BoltClock 的答案.

Finally I solved the problem as indicated on BoltClock's answer.

<span class="k-editor-val-message">
@Html.LabelFor(m => m.Description, new { maxlength = 1000, @class = "editor-label" })
@(Html.Kendo().EditorFor(m => m.Description)
    .Name("Description") 
    .HtmlAttributes(new { @class = "editor-field", style = "width:660px; height:140px;", 
         required = "required", data_required_msg="Required field"  })
)
@Html.ValidationMessage("Description")
</span>


<style> 
    .k-editor-val-message > .k-invalid-msg {
        // proper position
    }
</style>