Abstract: According to mining requirements,rock mass below -400m level of 1^# orebody in Anqing Copper Mine are comprehensive evaluated through engineering geological investigation(investigation of rock mass structure,statistic of structural plane occurrence) and quality evaluation(rock hardness degree,integrity condition,basic quality classification,quality classification of engineering rock mass).The results show that rock mass structural planes can be divided into 5 groups,and the advantage occurrence of the most developed structural plane group is in line with F1 fault.28 ° azimuth is the best axis direction of mining,and important project (stope,drilling chamber,etc.) generally is laid out along the direction vertical to the orebody strike,which is helpful to stability.Four kinds of rock mass are hard rock or semi-hard rock,good integrity,and quality of engineering rock masses belongs to III.The conclusion will provide basic data support for later mining.