The population density of amphibians can greatly influence the dynamics of these populations by changing several key population parameters, such as mortality, development, reproductive rate, and dispersal and migration, especially in the larval stage. Meanwhile population density may change dramatically due to changes in the environment,, thus affecting the development and survival rate of the larval stage. Therefore, studying the impact of population density on larval growth and survival may help to understand the mechanism of rapid amphibian population declining caused by environmental factors. Nonetheless, the effect of population density on amphibian larvae is very poorly understood. In this study, we conducted laboratory simulation experiments to investigate the effect of rearing density on the development and survival of Rhacophorus dennysi tadpoles. We measured the tail length, snout-vent length, development time, and survival rate of Rhacophorus dennysi tadpoles at four rearing density levels (15, 20, 25 and 30 ind/L) and significant differences in tadpole performance were observed between density levels -tadpoles reared at higher densities were significantly smaller at metamorphosis, had longer larval development time and lower larval survival at later stage compared to those reared at the lowest density. Compared to tadpoles reared at the 15 level, tadpoles reared at 20, 25 and 30 density levels was 11.6%, 11.8% and 13.9% less in tail length, respectively, and 11.1%, 9.5% and 12.9% less in snout-vent length, respectively. In addition, increased rearing densities had also significantly prolonged the development time of tadpoles and lowered the survival rate at later stages, although they did not affect the early survival of the tadpoles.