Abstract: This paper embarks from the earthquake geology viewpoint and discusses the earthquake stability of the catchment basin of Jin Ping Hydroelectricity Engineering on Yalongjiang River. The paper focuses on the seismic geologic condition, the historical earthquake situation, the pleistoseismic zone distribution and the seismic activity situation at the key areas of the Jinping I and Jinping II hydroelectric power stations. It further discusses the regional stability of the Jinping hydroelectricity project. The geologic conditions during the construction period are further analyzed. They include the Jin Ping fault discovered from two assistance transportation tunnels across the Jinping mountain and the faults f13, f14, f5, f8 and the fault F1 at the dam sites of Jinping I discovered from both tunnel excavations and slope excavations. The characteristics of the faults were in some expected conditions. The faults did not show any active signs. This paper therefore concludes the Jinping Ⅰ and Jinping Ⅱ hydroelectricity project is earthquake stable and should maintain invariability.