In order to seek reasonable cut-off grade for ore drawing in subdrifting and caving without sill pillar, the relative researchers have put forward various theories and methods. Based on the synthetic analysis of correlative documents, the three main kinds of genre on cut-off grade for ore drawing are summed up, which are the single cut-off grade, composite cut-off grade and dilutionless/low-dilution for ore drawing. Based on making a study of them, the single cut-off grade for ore drawing is regarded as less advantageous and less development potential than another two methods in theory.