The April 20，2013 MS7. 0 earthquake occurred in Lushan City，Sichuan Province， China，which was a result of east-west oriented reverse-type motion on a north-south striking fault． The source location suggests the event occurred on southern part of Longmenshan fault at a depth of 13km． And the great Wenchuan MS8． 0 earthquake of the May 12，2008 also occurred in Sichuan Province of the western interior China with an epicenter located at the longitude 103. 4°E and latitude of 31. 0°N． Both the 2 important earthquakes located on the Longmenshan fault zone， and the distance between 2 epicneters is 85km while the distance between aftershocks distribution of the 2 manshocks is 60km． In this study，the dynamic source process with the focal mechanism and empirical relationships was calculated and the related energy and apparent stress were analyzed，respectively． The results indicated that there was frictional undershoot behavior in the dynamic source process of Lushan earthquake，which is actually different from the overshoot activity of the Wenchuan earthquake． Moreover，the characteristics of the source parameters， radiated energy from the fault and the aftershocks distribution from 2 mainshocks were discussed． It indicated that the rupture process was under the influence of apparent stress and frictional behavior on the fault plane．