[Aim] The ovarian development, diffusion ability and pestcide selection of rice water weevil (Lissorhoptrus oryzophilus Kuschel) were studied to provide guidance for the prevention and control of the pest in Yunnan Province.[Method] The ovarian development of rice water weevil was determined by analysis of the ovarian anatomy of female adult. To determine the range of dispersal of females, we used field surveys and marked release and capture method. Finally, insecticide effectiveness against weevil was screened by using leaf immersion method in laboratory.[Result] From late April to early May 2009 at seedling stage, 100% rice water weevil at ovarian Ⅱ level was arrived. The average number of ovaries eggs at level Ⅲ and the maximum number of eggs laid were 8 grain·head^-1 and 23 grain·head^-1, respectively. Compared to rice seedling fields, the population density of larvae and adults of rice water weevil in replanted fields was higher. The number of returning larvae increased 4.82 times and the first generation of adults by 6.50 times. The control effects of the insecticides nitenpyram, chlorpyrifos, phoxim, triazophos and regent were effective at 96.11% against rice water weevil adults.[Conclusion] Rice water weevil in central Yunnan has a small natural transmission range and transplanting rice seedlings is the main mode of transmission. We recommend that spraying of insecticides such as nitenpyram, phoxim, triazophos and regent should be done at the critical period a week after removing the plastic film of rice seedlings.