The approach to studying the social spatial structure of cities has become very popularin the western countries since the first study of social area analysis was undertaken by Shevkyet al. in 1950s. During 1960s, this approach area was developed by using the technique of fac-torial ecological study. This technique has two characteristics. First, a large number of va-riables are used in the factor analysis or the principal components analysis, in order to extractsome major factors of social and residential differentiation. Second, it places much greateremphasis on the spatial patterns associated with those factors.