Heavy winter mulching to increase soil temperature and winter fertilization are widely used techniques for intensive management of Phyllostachys praecox forests to increase bamboo shoot production and economic return for landowners in subtropical China.The application of excessive mineral fertilizer has resulted in serious water pollution.The object of this study was to ascertain effects of reducing inorganic fertilizer rate or applying organic fertilizer on reducing the loss loads of different forms of nitrogen under Phyllostachy praecox stands by conducting a field experiment in main production area of Lin'an city, Zhejiang province.Four treatments were respective 1) control with zero fertilizer (CK), 2) conventional fertilizer (CF) at the rate of N+P₂O₅+K₂O=850+337.5+337.5 kg/hm² provided with 2250 kg/hm² of compound fertilizer and 1110 kg/hm² of urea, 3) decreasing inorganic fertilizer (DI) at the rate of N+P₂O₅+K₂O=510+337.5+337.5 kg/hm² provided with 2250 kg/hm² of compound fertilizer and 376 kg/hm² of urea, and 4) decreasing organic and inorganic fertilizer (DOI) at the rate of N+P₂O₅+K₂O=510+259.8+165.4 kg/hm² provided with 554 kg/hm² of urea and 46400 kg/hm² of pig manure.Fertilizer were separately applied in May 18^th, September 7^th and November 9^th with respective 40%,30% and 30% of total amount of fertilizer, and then plowed into soil at the depth of 5 cm.Water samples from runoff and leaching water were collected by special devices, totally 16 runoff water samples and 10 seepage water samples were collected around the year 2012.It was shown that the concentrations of different forms of nitrogen actually affected by rainfall, especially for particulate nitrogen (PN) in the runoff water.The concentrations of nitrate nitrogen (NO₃^--N), water-soluble organic nitrogen (WSON) and PN in the runoff water were at the range of 3.82-6.82 mg/L, 0.89-1.85 mg/L, and 0.89-1.83 mg/L, respectively, which accounting for 60.9%-68.2%, 16.0%-18.1%, and 15.1%-21.6% of total N loss, respectively.The concentrations of NO₃^--N, ammonium nitrogen (NH₄⁺-N), and WSON in the seepage water were 26.2-92.5 mg/L, 0.50-6.42 mg/L and 6.57-12.6 mg/L, respectively, which accounting for 75.8%-82.9%,1.50%-6.36% and 11.2%-20.6% of total N loss, respectively.Nitrate N was among the largest loss both in runoff water and seepage water.The loss loads of total N in the runoff water respectively decreased by 46.9% and 23.1% for DI and DOI treatments compared with CF, and the corresponding data for seepage water were 19.1% and 52.1%.In conclusion, decreasing inorganic fertilizer or decreasing organic and inorganic fertilizer play a remarkable role on reducing the loss loads of different forms of N under Phyllostachy praecox stands suggesting that reducing inorganic fertilizer rate and applying organic fertilizer was the useful practice to decrease the N loss.