Abstract: With the widely application of hydraulic tunnel, it is an important problem how to determine the scheme of primary support for hydraulic tunnel. Taking the hydraulic tunnel at Southern Main Canal of the South-North Water Transfer Project as an example, the scheme of primary support for hydraulic tunnel was studied. The results show that the steel fiber sprayed concrete is better than wire mesh concrete of primary support for this hydraulic tunnel, and it can more ensure the construction safety of hydraulic tunnel. The conclusions and suggestions are valuable for the engineering design and worth as references for the similar projects.