Abstract: On November 8,1997,a Ms 7.9 Manyi earthquake was occurred in Qinghai-Tibet.Using InSAR cosesimic deformation acquired by ESA ERS2 satellite,and combining with the fault trace derived form the correlation data and azimuth offset map and basing on dislocation model in elastic half-space,we derive the slip distribution by utilizing a sensitivity-based iterative fitting method.Distributed-slip model indicates that the cosesimic slip reaches about 6.78 m.The slip is concentrate to 12-112 km along the strike direction,with most of the moment release located on the shallow part above 16 km depth.The geodetic estimate of seismic moment is 2.01×1020 Nm(Mw 7.50),is consistent with seismic estimates.