To reveal the cutting process of aluminum alloy 7050, the oblique cutting finite element model was established to simulate the cutting process. The key techniques including material constitutive model and temperature finite element model were investigated. The chip of aluminum alloy 7050 formed in the simulation of cutting process, and the cutting force curve and cutting temperature distribution were analyzed. The chip obtained by simulation is spiral, and the chip shape of simulation agrees well with the chip of cutting experiment. The oblique cutting finite element model of aluminum alloy 7050 can be used to investigate the optimization of cutting parameters and tool angle further.