To further enhance the machining performance of the electric spindle,taking the common A02 electric spindle as research object,different parts of the mandrel were replaced with carbon fiber material with small thermal expansion coefficient and excellent vibration reduction performance.Four types of carbon fiber-metal composite mandrel were designed and their impact on the A02 electric spindle was explored.Through finite element analysis,the dynamic and thermal properties of the four carbon fiber-metal composite mandrels and the conventional steel mandrel were evaluated.The results show that the all-carbon fiber mandrel has the best performance,while the inner carbon fiber mandrel can achieve similar results to the all-carbon fiber mandrel without using a large amount of carbon fiber material.The outer carbon fiber mandrel has a mature processing technology and processing tests can be performed directly.Several existing or feasible schemes for machining carbon fiber-metal composite mandrel were listed,providing reference for a better combination of carbon fiber materials and electric spindle structures.