Due to construction difficulties，such as ship positioning，anchoring and anchor removal，destruction of blasting line，and verticality control of drilling rig casing，in the construction of rapids shoals in class J sections，the traditional construction scheme is no longer applicable for construction operation. This study summarizes and develops a set of key technologies for borehole blasting construction of rapids shoals with the drilling rig ship through practice. The comprehensive utilization of the modular combination hull，ship positioning system with seven anchor cables，vertical casing guidance system，parallel double-drum windlass，initiation network，and other key reef blasting construction technologies enables the construction ship to be dispatched for construction in any navigation area. In the class IV channel regulation and construction project on Lancang River from Boundary Marker 244 to Lincang Port，the navigation area has many types of dangerous shoals，and the flow velocity on the shoals in this area is 3.5 m/s to 6.5 m/s. The proposed scheme achieves a favorable construction effect. This scheme can effectively avoid such disadvantages as high unit explosive consumption and difficult control of exposed blasting technology under vortex flow，deep rapids，and other complex conditions，and it can thus serve as a feasible and effective construction scheme for rapids shoal construction.