Abstract: Based on the analysis of strata migration mechanism,with engineering background of 1201 working face,this paper studies insecure factors of fully-mechanized top coal mining in large angle inclined soft working face.The factors have impacted the normal generation badly,including rib spalling,roof fall and equipment slide,etc.Combined with the stress analysis of the coal wall,effective measures are put forward to avoid rib spalling,roof fall.Analyzing the stress analysis of the support,we get the measures avoid supports toppling down and biting to each other.Findings of the study provide strong guarantee for overburden strata control technical,rule out safe hidden trouble for realizing coal mining efficiently and securely at the same time.