天津市近海地震观测试验系统首次在井下将测震仪器和前兆仪器进行组合观测，可为海底地震观测技术的进一步发展积累经验，为海底地震监测和前兆观测积累大量的基础观测资料，具有良好的社会效益。

Tianjin seaquakes observation examination system is an important experiment in such field. This paper introduces the technical system and the steps of construction in detail. The precursory observation equipment and sea seismograph were in a combine underground for the first time. The system has accumulated rich experience to the further development of seaquake observation technique, accumulated amounts of data and achieved good social benefits