This research was carried out in Human Region

Pearl River Delta form December

1992 to February

1993. By the Poisson distribution and the negative binomial distribution

the population spatial patterns of Rattus rattoides and Bandicota nemorivaga was studied. The main results are as follows:①The population spatial patterns of Rattus rattoides and Bandicota nemorivaga in winter fit the negative binomial distribution. ② The assembling intensity of Bandicota nemorivaga population is higher than Rattus rattoides population. ③ The population spatial pattern of Rattus rattoides and Bandicota nemorivaga show random distribution in reproduction season. ④ The population spatial pattern of Rattus rattoides and Bandicota nemorivaga trend to positive correlation low population density

but negative correlation in high population density.