Abstract: Maraging steel has excellent mechanical properties and mechanical properties and is widely used in aerospace, marine and vehicle manufacturing engineering fields. However, since this material is a typical difficult-to-machine material, the quality of the machined surface is poor, and the tool wear is serious. Therefore, the minimal quantity lubrication is of great significance for the machining performance of ultra-precision machining of solid solution and aging martensitic steel. In this paper, the research on the machining quality of ultra-precision machining maraging steel 3J33C, such as cutting force and surface roughness, is carried out in detail by using two heat treatment methods of solid solution and aging of maraging steel 3J33C. The material removal mechanism in the solid solution state and the aging state is revealed, which guides the processing technology of the difficult-to-machine maraging steel.