Abstract: Baima mountain reservoir dam of Guizhou province is a single concrete gravity arch dam with a maximum height of 48 meters, which built by laying stones rubble by masonry technique.This article analyzes the dam body structure, stress deformation and dam abutment stability by adopting analogy method and combining ADAO arch dam analysis and optimization software, it adjusts the design scheme of dam body to satisfy the requirement of SL25-2006 and SL282-2003 technical specification.