Hello Wei Wei,
I have already responded to the support ticket you have submitted but I will add my response here as well, in case anyone else needs to know how to change the template of the row filterable Kendo UI Grid.
If you wish to keep the input element on that column, you can pass an empty function to the columns filterable cell template configuration option:
The columns filterable cell template will give you access to the input element and you can style it to match the Kendo UI theme by adding the "k-textbox" class to it or just leave that function empty to get a standard input element.
Alternatively, you may use the columns filterable cell template configuration to create a Kendo UI DropDownList, ComboBox or another widget of your preference.
I prepared a sample demo illustrating these options at:
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