With the development of subcontracting in the aviation industry,it has become mandatory require-ment for suppliers to obtain NADCAP certification.A systematic analysis and recommendations have been made on the requirements of audit for NADCAP of Chemical Processing,including audit website operation,document control,personnel training,equipment calibration,material control,environment control,test and inspection,by introducing NADCAP of aviation subcontract production,accreditation process for NADCAP of chemical processing,and typical nonconformance cases.The article is intended to deepen suppliers under-standing of NADCAP and improve the accreditation efficiency for NADCAP of Chemical Processing.