everone. I was try to add a button after the import button. I was try like this :
<?xml version="1.0" encoding="UTF-8"?>
<templates>
<t t-extend="ListView.buttons">
<t t-jquery="button.oe_form_button_create" t-operation="after" >
<button name="button_import" type="button" t-if='widget.modelName == "my.model"' class="btn btn-sm btn-default o_import_button o_import_import">Upload</button>
</t>
</t>
</templates>
And yes, it's working. the button is diplayed after the button create, but i want put the button after import button.