Abstract: Aiming at the characteristics of mine blasting effect evaluation，the extension theory is introduced to evaluate the bench blasting effect in Huangmailing Phosphate Mine.Three parameters of blasting quality，safety and technical and economic benefits are selected as first-rank evaluation indexes.Nine parameters of loose coefficient，boulder yield，toe rate，foreward，backward，blasting vibration，fly rock distance，explosives specific consumption and ore caving amount per meter is considered as second-rank evaluation indexes.The calculation results show that：the blasting quality is within the range of good，and blasting safety，economic efficiency and ultimately blasting effect all are within the range of excellent.Finally，comparison of the blasting evaluation results with the actual situation shows that it is consistent with the actual situation.Therefore，the application of extension theory to evaluating mine blasting effect is feasible，and has engineering application value.

Key words: Extension theory, Mine blasting, Blasting effect, Evaluation system