Abstract:The Rice Water Weevil, Lissorhoptrus oryzophilus, was first discovered in the paddy field in JI’an county, Jilin Province on 27th July, 1993.When and how the RWW could enter the area were analysised, based on the investigation of 2nd to 4th September on the quarantine insect.Also, the strategies of restricting further spread of the pest were brought forward.