A hydrological observation in Phyllostachys praecox cv. Prevernalis stands converted from croplands at eight different densities (10800±400, 11600±400, 13200±400, 14800±400, 16400±400, 20800±400, 22400±400, 22800±400 individuals per hm^-2) was carried out to study their canopy interception characteristics. The results showed that the rainfall had a parabolic relationship with throughfall and stemflow, and had a downward parabolic relationship with canopy interception, respectively. The average rate of canopy interception of the eight stands ranged from 1.42% to 37.58%, and the stand density had a downward parabolic relationship with the maximum canopy interception and average canopy interception rate. At the stand density of 17209 individuals per hm^-2, the average canopy interception rate was maximum (31.15%) and the maximum canopy interception potential was 39.07 mm. Therefore, a proper stand density could fully favor the ecohydrological benefit of P. praecox cv. Prevernalis stands.