Abstract: In the area of major technological innovation in chemical remediation of contaminated soils,intellectual property rights,especially patents,should be deployed in all inventions.The trend of the patent application from the statistical analysis of the number of patent applications and the distribution of the applicants in China and around the world were analyzed in this paper.The technical direction and technical means of electro-chemical repair and other general devices and components of the invention of several major research direction were focused on,and its cutting-edge technology also researched.