Inoculation tests showed that Hirschmanniella oryzae could cause yield losses of rice, especially reduced the number of panicles and grain weight. The susceptible stage of rice is the reviving stage, inoculations of300 and 470 nematodes per plant caused 8. 8% and 13. 5% yield loss at the stage. Integrated control measures included tobacco rotation with rice, rice straw return to paddy field, winter ploughing and winter planting, use of tolerant rice cultivars. The reviving stage of transplanted rice seedling is the optimum time of chemical control for riceroot nematodes.