Based on the UDF of FLUENT software , this paper establishes the model of ignition and dynamic burning process , and studies on the ignition and shift of burn surface of star grain solid rocket motor .The results show that when the motor is working , there is a pressure gradient between the head and tail of the grain .Comparing to the root of the star-shape of grain , the ignition process is slower in the slot . Using FLUENT software can carry out a simple simulation of the shift of burn surface in star-shape grain.%基于FLUENT软件的UDF二次开发模块，完成了星型装药燃面点火和燃面退移的建模，研究了星型装药固体火箭发动机点火和燃面退移过程，结果表明：星型装药固体火箭发动机工作时，装药头部与尾部存在一定的压强差；相比于星根区域，星角区域的点火过程进行的更加缓慢；采用商用FLUENT软件可以实现简单的星型装药燃面退移过程模拟。
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