Pay the annual patent fee, first, pay the patent fee directly to the China National Intellectual Property Administration Patent Office or the local patent office agency; Second, the patent fee should be remitted through the post office. When remitting patent fees through the post office, the correct application number (or patent number) and fee name (or abbreviation) should be stated in the postscript column of the remittance slip; The third is to find an agency; Fourth, online payment cponline.sipo.gov.cn (China Patent Electronic Application Network).