Taking rebound modulus value of cement stabilized weathered sand distributing around the Three Gorges reservoir as the research object, we made samples by mixing the weathered sand with 3%, 5%, 7%, and 9% cement respectively, then cured the samples for 7, 14, 21, 28, 35, 56, 70 d respectively, and carried out the resilient modulus test. The experimental results show that mixing cement can significantly improve the rebound modulus value of the weathered sand. Under the same curing age, with the increase of cement content, the rebound modulus value gradually increases and its growth magnitude first increases and then decreases. The relationship between the cement content and the rebound modulus value expresses good logarithmic function. Under the same cement content, with the increase of curing age, the rebound modulus value also gradually increases linearly. Within the first 28 days of curing, the growth of rebound modulus value is about 95% of that of the entire test period. Through regression analysis, the mathematical model between the cement content and the rebound modulus values and the mathematical model between the curing age and the rebound modulus values were established respectively. And the correctness and the accuracy of the mathematical models were further verified through additional test.