Abstract: Abundant experience and important achievements of Chinese engineers in application of chemical theories and fruits to solve geotechnical engineering are systematically introduced and reviewed A new concept, Geotechnical Chemistry, is presented for the first time as a new borderline subject which consists of following five parts: ①study of chemical action mechanism in Geotechnical engineering; ②micro test research of the engineering property of rock and soil;③development and study of new materials and techniques; ④special geotechnical projects related with Chemistry; ⑤research on toxicology problems in Geotechnical Chemistry and usage of materials Finally, the authors put forward some ideas of the developing strategy and direction of the new subject