The experiments on applying rice hull in paddy field and applying rice hull coordinating with system of rice intensification(SRI) to control weeds were conducted. The results indicated that applying rice hull in paddy field had obvious effect on weed controlling and the optimum applying amount of rice hull was 1500kg/ha. Applying rice hull coordinating with SRI increased rice yield by about 15%, controlled weeds and decreased weeding by hand for 2-3 times. This practice also improved the environment and rice quality.