Based on the data of rainfall, throughfall, stemflow and climate at the II watershed of Huitong for Chinese Fir Ecosystem in 2015，we analyzed the canopy interception characteristics of Chinese fir forest, and the driving forces, and also verified the applicability of the Gash (1995) model to simulate the canopy interception. The results showed that: (1) The rain frequency was the highest in May and the amount of rainfall was the highest in August. In the whole year, the short-time light rainfall was the main form of single rainfall; (2) Throughfall, stemflow and canopy interception were positively correlated with the rainfall; (3) Gash (1995) model simulated annual cumulative canopy interception was 235.62 mm, which was in good agreement with the measured values (254.16 mm); (4) The accuracy of Gash (1995) model was mainly affected by canopy saturation capacity, annual evaporation and the ratio of average evaporation rate (E ?) to average rainfall intensity(R ?). In this study, the value S is reasonable, but the E ??R ? remains further to be more accurate.