This paper discusses similarity criterion in similarity theory, and how to derivate similarity criterion of mathematics simulation model by dimensional analysis. A example for this method is given.
讨论了相似理论中的相似准则，以及如何用因次分析法推导数学仿真模型中的相似准则，并举例说明了这种方法的实用性。
Some results are as follows:(1) A 1:25 scale model was built following the gravity similarity criterion. The gate closing and opening force in hydrodynamic conditions was studied.
按重力相似准则建立了1：25溪洛渡泄洪洞模型和事故闸门水力相似模型，研究了该事故闸门动水闭门持住力和动水启门力。
Basing on the heat conduct model of gun charge, the heat transfer of gun charge is analyzed with similarity criterion.
在建立火炮发射装药热传导模型基础上，采用相似原理对其进行了分析。
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