Based on characteristic of stainless steel material, its milling performance is analyzed. Milling force of 1Cr18Ni9Ti stainless steel was obtained with single-factor test of milling depth, line spacing, and feed per tooth on a CNC Milling Machine. An empirical model for the milling force of stainless steel was established by regression. The validity of the model is verified by comparing the model data with the experimental data. The impact of milling parameters on milling force is sorted in order of milling depth, feed per tooth and line space according to the exponents in the model. The conclusions have great help for the milling cutting tool’s design of stainless steel and the selection of milling parameters .