Abstract: As a special engineering geology phenomenon, the development degree evaluation of karst is one key of engineering design. Based on karst foundation engineering of Ye Gang 220 kV substation in Huangshi, the engineering site is divided into some small zones, and the surface density contour of karst cavity, three dimensional contour of bedrock surface, and drilling hole event rate contour are drawn by using software sufer. Based on the graphics and practical data the micro\|zoning of different karst development degree is evaluated, which provides reference for engineering optimization design.

Key words: karst development degree, micro\, zoning, evaluation method