To explore the water conservation capacity of vegetation in the forest park and provide a reference for vegetation configuration and management, six typical stands in Tianlong Mountain Forest Park were selected to investigate and analyze the litter thickness, accumulation, water holding and other indicators inside the forest. Soaking methods were used to measure the hydrological effect of litter.(1) The interference and thickness of litter ranged from none to moderate and from 0.57 to 2.63 cm, respectively, among which, Populus davidiana gave the largest, and the mixed forest of Platycladus orientalis-Pinus tabuliformis-Armeniaca sibirica gave the smallest. The accumulation range was 7.20~16.30 t/hm², among which, Pinus tabuliformis-Platycladus orientalis mixed forest was the largest, and Platycladus orientalis-Pinus tabuliformis-Armeniaca sibirica mixed forest was the smallest. (2) Except for Populus davidiana, the maximum water holding capacity of the semi-decomposed layer was greater than that of the undecomposed layer, among which, Pinus tabulaeformis-Platycladus orientalis was the largest and Platycladus orientaliswas the smallest. The maximum water holding rate of undecomposed layer was larger than that of semi-decomposed layer, the largest was found under Robinia pseudoacacia and the smallest under shrub. The range of maximum water holding capacity was 20.02~27.90 t/hm², and the range of maximum water holding rate was 187.40%~277.89%. The water holding rates of coniferous and broad-leaved mixed forest were comparatively higher. (3) The maximum effective storage capacity of tree species was found in Populus davidiana with its value of 15.05 t/hm²; the minimum was Pinus tabuliformis of 12.33 t/hm². Platycladus orientalis-Pinus tabuliformis-Armeniaca sibirica mixed forest had the maximum storage rate. (4) The relationships of litter water holding capacity and water holding rate with time could be fitted by logarithmic and power functions, respectively. Both of them reached the peak values within two hours of soaking in water. Based on the comprehensive comparison of six forests, light disturbed Populus davidiana had the best hydrological benefits; oppositely, moderate disturbed Pinus tabuliformis-Platycladus orientalis mixed forests had the worst. The broad-leaved species had better hydrological effects than coniferous species, and the mixed coniferous and broad-leaved species were better than a single species. These consequences can provide references for the vegetation configuration and hydrological benefit evaluation of forest parks.