Abstract: According to the engineering problem of existing drilling cutting test methods and standards in kilometer deep mine, by theoretically analyzing and field measuring, we explore the drilling cutting method and standards of applying φ75 mm large diameter borehole to instead of φ42 mm borehole. The results of research show that the variation of amount of φ75 mm drill cuttings consistent with that of φ42 mm drill cuttings, therefore,φ75 mm borehole cuttings can replace φ42 mm boreholes. Large diameter borehole drilling cuttings test method has been used in Henan Yima Mining field with good results.