Aimed at the special flexible joint structure of a spacesuit arm,an algorithm for fast solution of inverse kinematics,based on the nearest neighbor algorithm is presented.It can obtain the approximate solution of joint angle of spacesuit arm at any measuring position.The two-step spatial searching method is presented and it overcomes the defects of large memory and low searching efficiency in solving the inverse kinematics of the arm of EVA spacesuit.Simulation results from the SGI work station verify that the presented algorithm can meet the requirement of test system very well in calculation precision and real-time capability.