In order to verify the feasibility of reinforced concrete lining at the high pressure turnout of? Shenzhen Pumped Storage Power Plant, a field investigation of hydrojacking was done at site. Test results and P-Q curves show that the jacking pressure of surrounding rockmass is 1.2 times higher than internal water pressure. Therefore, on the basis of the effective anti-seepage design adopted, the reinforced concrete lining at the high pressure branch is feasible.