In the waterway improvement projects,underwater blasting is often used to remove the reefs that obstruct navigation,and the shock waves generate by blasting would affect the safety of fish.At present,bubble curtain is commonly used to reduce the shock waves peak pressure.In this study,a numerical model of bubble curtain is constructed to investigate the reduction effect of bubble curtain on blasting shock wave pressure and the minimum length of fish survival under the effect of different arrangements.The results show that the reduction of shock wave pressure by bubble curtain is greater in the first half(65%-69%)than in the second half(10%-12%).With the increased of bubble volume proportion,the reduction rate of bubble curtain on shock wave peak pressure also increases.However,when the bubble volume proportion reaches 40%,the increase of reduction rate decreases and tends to level off.The minimum length of fish surviving under the bubble curtain 10,15,and 20 m from explosive sourceare 20~34,14~30,and 12~24 cm respectively,and the minimum length of fish surviving under the bubble curtain thickness of 2,3 and 4 m is 12~24,10~22 and 6~17 cm respectively.The results of the study can provide theoretical basis for the protection of fish resources under the implementation of waterway regulation projects.