There are two main problems for simulating distribution of population using RS data: ①how to obtain information of residential type

area and position;②what relation between residential type

area and position and amount of population.Basing on geographical sense and mathematical sense

this paper extends the model of allometric growth of urban population-area study

works out model of rural and urban population-area.Then

taking Songyuan city as a case

using 1∶50000 relief map as assistant data

building up classification system of residential points

using the method of "detaching urban-rural population" based on above the models

this paper uses ETM images to extract information of residential area and simulates population distribution in the urban and rural region.The method used in this paper can be referenced by the theoretic and applied researches for middle-scale population distribution.