Micromilling is an effective manufacturing technology for 3D microstructure parts with various material characteristics and has widely application prospects. However,due to sharp decreases of the machining scale and parameters,micromilling process shows many differences from traditional milling. There have been a lot of researches on micromilling process and cutting force modeling,but they mainly aimed at a single phenomenon or a few phenomena,at present there is no systematic study that describes the micromilling mechanics,so it is necessary to comprehensively review the cutting force modeling approaches. The cutting force modeling of micromilling is thoroughly discussed and summarized,by combining the latest research progress of the micromilling technology at home and abroad,and starting from the different mechanics between micromilling and traditional milling. The effects of cutting edge radius,tool runout,deflection and tool wear on cutting force modeling are surveyed. In the end,hot research topics are raised and problems that yet to be investigated are summarized.