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According to theory of metal cutting and heat transfer, mathematical model of temperature field when work piece is milled by ball-milling cutter was established using moving heat source theory. Joint modeling method of work piece temperature field was studied in the environment of PRO/E and ALGOR. Three dimensional modeling of work piece was finished by PRO/E, and all-moving surface heat source's temperature field in milling process were dynamically simulated and had finite element analysis using ALGOR, and then distributed characteristic of the temperature field and rule that temperature on each point changed with time were got. This technology has laid a foundation for research of milling temperature's dynamic simulation and milling thermal deformation.