Objective: To optimize ultrafine grinding process of Mylabris phalerata. Methods: The Box-Behnken design-response surface methodology was adopted to optimize ultrafine grinding process of Mylabris phalerata with moisture content,grinding time and medium as investigate factors,the overall desirability( OD) of cantharidin content and powder particle size D_(90) as indexes,and the cantharidin content before and after smashed was investigated. Results: The optimization ultrafine grinding process was as follows,...