Abstract: By investigating rainfall amount, through fall intensity, leaf area index, canopy dryness and evaporation coefficient influencing the canopy interception of northern subtropical bamboo forests, the author carried on studies of interception modeling.The results indicated that: error amounts became notable when real canopy interception amounts was large error amounts became unconspicuous when real canopy interception amounts were small. In order to reflect the distribution of relative error on model of canopy interception, absolute value of relative error was made 4 subsection to accumulate, which respectively were <5 %, 5 %—10 %, 10 %—20 %, >20 %,and the corresponding real canopy interception amounts were 45.12, 69.44, 40.79, 15.83 mm respectively, simulative canopy interception amounts were 44.82, 67.7, 35.14, 11.61 mm respectively. Relative error of canopy interception in a year was 9.3 %, which indicate we have obtained a better simulation effect.