The Lushan MS7． 0 earthquake on May 5，2013 in Sichuan Province is another strong earthquake occurring in the Longmenshan fault zone following the Wenchuan MS8． 0 earthquake in 2008． The similarity between the both is that there is no noteworthy anomalous change． In order to study the deformation pattern prior to the earthquake，this paper processes the continuous observation data in the near-source area to calculate annual-entropy and analyze its distribution characteristics in time series based on the entropy theory． The results showed that the earth tilt in near-source area decreases obviously before the Lushan earthquake，and the time sequential annual-entropy showed that the Wenchuan MS8． 0 earthquake had a trigger action on the Lushan MS7． 0 earthquake，and the entropy variation trend of EW direction is in high accordance with that of NS direction．