Abstract: Objective:To observe the effects of muscle strength training on patellar strain.Methods:Forty students with different agree patellar strain from physical education department were randomly divided into rehabilitation group and control group.The rehabilitation group and control group taken exercise by quadriceps isometric exercise and standing on the peg,respectively,the effects of two groups were compared.Results:The total effective rates of two groups were 85.0% and 65.0%,respectively,the differece of which had no statistical significance(P0.05).The difference of the total scores of clinical symptoms in two groups had no statistical significance(P0.05).The differences of the knee pain scores and quadriceps peak torque increasing in two groups had statistical significance(P0.01).Conclusions:Muscle strength training can significantly strengthen quadriceps strength and alleviate the symptoms of patients with patellar strain.