The Jinggu earthquake(M_s6.6) occurred on October 7~(th).2014 in Yunnan province,led to severe ground fissures near epicenter region.Base on field survey.combining with focal mechanism,aftershock distribution and isoseismal maps,we analyze the possible cause of these ground fissures,and find that the action of gravity plays an important role in the fissure formation.We also discuss the different mechanisms and models of these ground fissures,which could provide a good example for research of ground fissures...