Carbon fiber reinforced plastics （CFRP） are widely used in aerospace and automobile field because of its advantages， such as high strength and excellent corrosion resistance. However， due to its heterogeneity and anisotropy， the machining process is more complex than machining of traditional metal materials， which can lead to serious tool wear. In order to address this issue， PCD milling cutters are selected to conduct T800 CFRP multi-directional laminates milling tests under cryogenic condition. And then， the effect of cutting parameters and jet temperature on wear band width of flank face VB are analyzed. The results show that VB decreases with the increase of the cutting speed and the feed per teeth， and smaller VB is obtained when coolants temperature is -50 ℃. In addition， nonlinear fitting of the test results is carried out by MATLAB. The empirical model of mapping relationship between cutting parameters， coolants temperature and VB is obtained， which can provide key support data for T800 CFRP milling tool wear suppression and tool life prolonging.