Underwater reef blasting，as an important link in waterway construction，expansion，and dredging engineering，is also the main factor affecting the efficiency and safety of the whole project. To analyze the influence of blasting effect factors on the safety discrimination，we carry out the study on the field monitoring，adopt double factors of velocity-frequency and blasting vibration speed-frequency-duration of blasting with triple factors in research methods to compare and analyze the results of the field monitoring and obtain the fitting formula and the corresponding fitting accuracy. The results show that the formula of triple factors has a higher fitting precision. The duration of blasting should be considered as the important effect factor when underwater blasting induces vibration. Formula （5） is the optimal criterion method suitable for the safety of underwater blasting engineering.