An optimization design scheme of 3D laser scanning and locating system was proposed in this paper.Athermalization design was conducted for the laser launching and receiving opto-mechanical system.Moreover,a mathematical model with elastic space ring design parameters was rationally chosen.The dimensional parameter optimization design was implemented for the U sports framework.The findings indicated that this opto-mechanical structure was kept at two limit temperatures (-10 ℃ and 50 ℃).The maximum axial deformation of the mirror group was less than 0.1 mm of the assembly error.The maximum stress distribution value of the lens was 14.365 MPa,which was less than the yield strength of materials.The first-order inherent frequency of the optimized sports framework was increased to 2236.2 Hz and it could undertake the impact of 10 g accelerated velocity.The test results showed that the maximum range error of the system was 32.6 μm,which was less than 0.1 mm of the error requirement.The repeatability error was ±27 μm,meeting the requirements of technical indexes.