Abstract: Aiming at the falling rock slide filling and roof breaking features in large angle and specially thick seam fully mechanized caving mining, the study took the overlying rock of large dip angle seam as inclined elastic plate, the theory of "plate" is used to study the stope roof strata behavior laws in the large dip angle fully mechanized caving mining. Research shows that the stope breaking features are closely related to the degree of falling rock sliding and filling, and they are greatly influenced by the waste rock.According to the different conditions of the stope roof to study its breaking features, the article concluded the strata behavior and roof breaking features in the large dip angle and specially thick seam fully mechanized caving mining.