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Most deep earthquakes occur in subduction zone and there are almost no earthquakes at the depth over 700 km. Some previous studies showed that the cufoff of the deepest earthquakes are related to the absence of the transformational faulting caused by metastable phase or loss strength of slab due to superplasticity. Here we report that the low stress limit in deep subduction zone caused by perovskite rheological properties can account for this issue. In this study, the possible limits of stress accumulation at different depth in subduction zone were obtained by considering both the dislocation creep of minerals and the elastic deformation of the subducted slab. Firstly, the basic condition of stress accumulation was supposed to be that the elastic strain rate generated by plate motion is no less than the creep rate of the minerals in subduction zone. Secondly, the temperatures in the subduction zone were obtained by …