In order to ensure the boring machine to work, star wheel loading mechanism must have good loading properties. The force of star wheel of EBZ160 loading mechanism is analyzed based on the creation of three-dimensional model of star wheel by using PRO/E software. Static analysis is done by importing the three-dimensional model of the star wheel in ansys. Checking the strength of the program star wheel. Based on the meet of the strength of the star wheel, topology optimization is done by using the OC method. The results obtained from topology optimization can be seen, basically meet the requirements of this program the amount of material is decreased by 20kg than before. The theoretical basis of improving star wheel design and improving performance is obtained.