Based on mechanical arm kinematics, inverse kinematics, and differential idea, a research platform with seven degree of freedom manipulator arms was built using EV-MRobot to study the spatial positions of clockwise and counterclockwise rotations in manipulator arms. The spatial position of clockwise rotation was calculated by a formula of translating the superposition of spatial coordinates to the end point positions. Through the Method of Fractional Steps and Method of Fractionate, spatial coordinates were inverted and counterclockwise rotation was calculated. Using a Differential Method, the initial linkage was calculated and the Method of Fractionate was employed to optimize the linkage process. The experimental data proved the validity and feasibility of the strategy.