In order to improve the flatness measurement results of parts,the imp roved multi universe algorithm is proposed.Firstly,the flatness measurement mo del of parts is established,and the objective function of nonlinear optimizatio n problem is set.Secondly,the wormhole probability of multi verse optimization is adjusted based on logarithmic function,with the iteration times,the probabili ty of objects crossing wormhole is increased,so that accelerating the movement of verse and improving the search performance.Thirdly,the moving step length of multi verse is optimized based on exponential function,the verse is explored glo bally fast at the beginning of the iteration using large value,while developed l ocally slowly using smaller value at the late stage,so that enhancing the abilit y of exploration and development.Finally,the process is given.The experimental r esults show that the average measurement error of the improved multi universe al gorithm is 5.212μ m,which is 37.63%,33.61%,27.51%,19.41% and 10.17% less t han LSM,PSO,GA,DE and ANN algorithm respectively.The measurement time is 3.282s,which is 36.95%,30.33%,26.11%,18.52% and 12.74% less than LSM,PSO,GA,DE an d ANN algorithm respectively,it is better than other algorithms obviously.