Abstract: On the basis of consulting treatises of Mr. Gu Dezhen before his death,it is discovered that he not only is a wellknown scholar of engineering geology at home and abroad,but is a development scholar of research of engineering earthquake in China. He started to follow with interest the earthquake problems in engineering construction since the engineering of harnessing Huai river as early as 1951,and specially focused on the problems of engineering earthquake since the Xinfengjiang reservoir induced earthquake at 1959. He presented the scientifically thins and technical methods on evaluation of earthquake safety in engineering area. He presented new conception on active fault,and suggested to call all the active fracture since late pleistocence as active fault. He also put forward that identification active fault start from regional tectonic development history. He presented the scientifically point on genetic mechanism of reservoir induced earthquake,which combined effect of water loading, strong weakening and pore pressure caused by water infliction along fault zone. Mr. Gu applied above points,thinks and methods successfully to a series of great engineering practices,for example harnessing of Xinfengjiang reservoir induced earthquake,dam site selection and investigation of Gezhouba and Danjiangkou reservoir, etc.