Abstract: It discusses the key problems with similarity criterions of rock movement parameter.Bing based on π theory，as well as extending dimension M、Lx、Ly、Lz、T instead of traditional dimension M-L-T，it deduces similarity criterions of mining subsidence by Rayleigh method，and establishes trend、up、down function models with similarity criterions for prediction parameter and angular parameter.These models provide basis for calculation of rock movement parameter and analysis of similarity experiment.

Key words: Rock movement parameter, Function model, Similarity criterions, Rayleigh theory