Abstract: The quality evaluation of deep underground engineering rock mass without excavation has always been a focus problem in the worldwide area of engineering geology and rock mechanics. When the site conditions cannot meet the wave velocity test requirements, how to use the rock mass volume joint count to evaluate the integrity of rock mass becomes the key to accurately evaluate the quality of deep engineering rock mass. Based on the ultrasonic borehole imaging technology, a calculation method of determining J_v through borehole image logging data was put forward, which is named the borehole perspective method. According to the positions and azimuth of joints, the relative position between joints and a borehole in a unit volume is deduced, and the joints can be divided into four types, so that the total sum of joint numbers of four types is calculated correspondingly, and then the J_v value at the corresponding depth is obtained. The borehole perspective method is applied to the J_v calculation of the deep rock mass revealed by the borehole HHZK in the open-pit stone mining area of Changle County, Weifang City, Shandong Province. The saturated uniaxial compressive strength R_c of the rock core is calculated with the test results of field point load strength tests, and the BQ method is used to evaluate the quality of the deep engineering rock mass in this area. The results show that the deep rock mass revealed by the borehole HHZK, which is classified by using the BQ method, is mainly categorized into ratings Ⅱ, Ⅲ, and Ⅳ. The rating Ⅲ and Ⅳ rock masses at the depth of 34~150m are mainly biotite plagioclase gneiss, granite porphyry, and granodiorite. The rating Ⅱ, Ⅲ, and Ⅳ rock masses at the depth of 150~400m are mainly granite, vein migmatite, structural breccia, and migmatite gneiss. The research results provide data support for rock mass quality evaluation for local mining development and geological environment treatment, which also verify the applicability and reliability of this method.