Abstract: In this thesis,the fundamental of optical projection measurement for aspheric sureface is explained,the simulation calculation with computer is put forward and the aim of simulation is defind.We choose the reference sphere fitting into asphere,educed the calculation expressions of the vertical axis distance and measured the distance in the reception screen according to the optical theory and math formula.And also we simulated the vertical axis distanced with C Programme and obtained the simulation asphere curve using excel.The simulation caculation result is in accordiance with the theoretical calculation and meets the accuracy of +0.001um.