The underground mining chain saws do not need to do the large-scale stripping skin and mountain earth. It can mine the finest marble resources directly. Less land acquisition and trees cutting, less slag and gravel, low cost of slagging and vegetation restoration. Fast exploitation, good appearance of blocks, high blocks yield. High production efficiency, it is not affected by the weather, day and night time, and it can control the mining speed progress, and has higher mining efficiency and benefit in the late stage when expanding to the left, right and downwardsides. Low comprehensive cost, good long-term benefits, low risks.