Abstract:The 4 year old masson pine stand was monitored on soil erosion in runoff plots. The results indicated: The water, soil and nutrient loss of forest lands with different site preparation overall site preparation or hole site preparation was biggest in the first year, 1049.70 t/hm 2(runoff), 5.35 t/hm2(soil loss), 12.91 kg/hm2(nutrient runoff) and 410.44 kg/hm 2(soil nutrient loss) in the full site preparation plots, 921.20 t/hm2, 5.79 t/hm2, 10.80 kg/hm2 and 467.93 kg/hm 2 respectively in the hole site preparation plots 1195 50 t/hm2, 2.87 t/hm2, 8.96 kg/hm2 and 200.05 kg/hm2 respectively in CK. The runoff loss was reduced year by year from the second year to the fourth year. The runoff loss of plots prepared with 3 types was serious in the first year and light in the fourth year, the runoff loss in the second and third year followed the order: overall site preparation>hole site preparation>CK. All these monitoring results provided a solid base for fast growing and high yielding stand establishment and soil fertility conservation.