Aiming at the anti-scouring technology of underwater foundation，we carry out a research on the preparation technology of bagged concrete. The results show that the water cement ratio has a significant impact on the compressive strength of the concrete. When the water cement ratio is not more than 0.83，the compressive strength of the concrete is more than 13.0 MPa；when the water cement ratio is not more than 0.66，the compressive strength of the concrete is more than 15.0 MPa；when the water cement ratio is not more than 0.54，the compressive strength of the concrete is more than 20.0 MPa. The sand ratio also has some impact on the compressive strength of the concrete，and the sand ratio shall be 41%～43%. The compressive strength of test mold concrete has a good correlation with the compressive strength of bagged concrete core sample. According to the experimental results，we propose the mix proportion parameters and design method of bagged concrete，which provides a technical guidance for the mix proportion design of bagged concrete for underwater foundation.