Pruning is one of the important measures for fruit trees management. Different pruning methods have different effects on the growth of fruit trees. Research on the law of apple tree growth after pruning is of great significance to guide production. Apple tree，as a perennial，is quite complex in observation，modeling and calibration，which makes researches related quite a few. In order to study more reasonable pruning technology，judgment of pruning reaction needs to ensure the accuracy，intuition and timeliness and the simulation technology makes it possible. In this thesis，apple tree was taken as the research object，the data which was measured from the field experiment was analyzed，the law of pruning reaction was summarized and the structure model and pruning model of apple tree were built. The simulation software of apple tree pruning was established based on the Qt framework and OpenGL graphics library. For a given production target，the simulation software of apple tree pruning provides an optimized solution of pruning through the optimal algorithm.