CMS model is used t o analyze i mport and export growth s ources and their change of China’s electrical p r oducts and communicative p r oducts before and afterWT O entry, the results show that during 1998 - 2001 and 2002 - 2006, the growth s ources of China’s import and export electrical products and communicative devices lie in competence fact or and demand factor, but the competence fact or contributi on rate to import is decreasing, demand fact or contributi on rate to export is decreasing . By comparison, its contributi on rate to import is increasing . Structure fact or contributi on rate to import or export is small and even has restricti on role . The import and export effect of China's electrical products and communicative devices shows that China's manufacturers for the products and devices is extensive expanding based on cheap labor and their development connotation has not been promoted .