Abstract: Spray polyurea elastomer technology is solvent-free and of no pollution in anti-seepage treatment. It has been widely used in anti-seepage treatment for water storage pool and water supply pipes, but not for reservoirs yet. To get experience, experimental application was adopted in seepage prevention and reinforcement project at Tangziguan reservoir. 2 years after the treatment, observation and test results showed that it was of advantages such as low cost, fast construction, no pollution and ageing resistance, worthy popularization.