This paper has designed a multi-degree-of-freedom electro-hydraulic mix- drive motion simulator, which could move and turn spatially. It has both the advantages of the parallel turnplate and the series turnplate. The homogeneous coordinate transformation matrix was used to analyze the simulator’s state of motion. The position and attitude matrix for describing the simulator movement has been obtained. The kinematics equation for showing the relation of the positions between hydraulic drive rod and the turnplate was given, thus provided the theory basis for the further research to the simulator.