| The coexistent rodents refers to the inquiline rodents that resides temporarily in houses, buildings and the periphery mouse class, mainly depends upon the survival condition which the human being provided, it mainly comprised by Rattus norvegicus, Mus musculus, Rattus mouse, etc. Rodents as a transmission of diseases not only harm for agriculture, industry, causing economic losses, but also transmit the plague spot, epidemic hemorrhagic fever and other diseases. To deracinate scientific rodent to control the density in the absence of the degree of harm is a question that public health need to answer. Holding Rodents 's variety, quantity, distribution and its long-term changes could provide the support to rat transmissible diseases. The main means of rodent control is anticoagulant rodenticides. The effect of rodenticides depends on the kinds of rats。With the using of rodenticides, the rodents will be resistance。So it is very necessary to know the distribution and kinds of the rats among a region to effectively control the rodent in a region. To investigate indoor coexistent rodent structure in residential areas, village in city and special industries indoor in Changchun and the resistance development of anticoagulant rodenticide in coexistent rodents. and provide the scientific basis for the rat control in Changchun city. From January 2007 to June 2008 , I made a research on coexistent rodents population distribution and drug-resistance of anticoagulant rodenticide in Changchun urban districts.Placing wire live traps baited with peanut indoor to catch coexistent rodent. Captured rodent were delivered to laboratory and were numbered ,weighted, identified and recorded. Tests was carried out without selectivity by rodents based on the method of National Rodenticide Resistance Monitoring Co-worker Group. Totally 129 rodent were captured. 86.82 % were Rattus norvegicus, 7.75% were Apodemus agrarius and 5.43% were Mus musculus. The dominant rodent at populated area was Rattus norvegicus and its percentage was 95.65%. The dominant rodent at special industries was Rattus norvegicus and its percentage was 94.44%. The dominant rodent at village in city was Rattus norvegicus and its percentage was 78.46%. The percentages of Apodemus agrarius in populated area and special industries were 0 respectively. The percentages of Apodemus agrarius village in city were 15.39%. 24 Rattus norvegicus were tested. The resistance rate was 0. The result showed that Rattus norvegicus had not become individual resistance to the resistance rodenticideⅡ(Brodifacoum).The survey conveys that The dominant rodent species of Changchun City was Rattus norvegicus, followed by Apodemus agrarius, Mus musculus. In the village to carry out anti-rat should be considered for different kinds of rat in the selection of rodenticides. Residential areas, special industries, Villages (urban) of the three habitats, Villages and high density residential areas, special low density industry, in which they should further strengthen the village's residential areas and the eradication of rats. The density of coexistent rodents in Changchun urban changes with the seasons with the volatility, reached a peak in April and November. According to the proposed density changes in the characteristics of the season, at the height of the focus on prevention and control before, to carry out anti-rat spring and autumn. The anticoagulant rodenticideⅡ(Brodifacoum) can be still used but should be used scientifically and properly with careful tests of sensitivity.
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