In China, shallow-sea oil and gas geochemical exploration has just begun and is only being conducted on a small scale; nevertheless, the work has a bright future. Based on our practice in Pinghu area of the East China Sea,the present paper has made a fairly systematic description of the development of shallow-sea oil and gas geochemical exploration and its methods and techniques as well as the preliminary achievementns obtained. A brief discussion is also given on the affecting factors and problems related to the inference and interpretation.