本文主要利用三坎雲形函數測試台北、台中、高雄三個都會區民國65年和78年間人口密度空間結構的型態及其變化。其間發現三個都會區有不同的空間結構型態及人口郊區化的現象，但郊區化的過程中亦存在明顯的差真性。在人口密度空間結構變化量上，本文利用二吹方函數建立都會區空間結構變化模式，並透過影響都會區空間結構的解釋變數，發現所得因素是解釋都會區空間結構變化的一個變數，經濟產業活動在空間上的變化量和人口在空間變化量無關，該測試結果並形成未來都會區發展政策上應注意的課題。

Thispaper proposed to estimate the types and changes of population density spatial struc﹒ture of are three metropolitan areas: Taipei， Taichung and Kaohsiung， during the year of 1976 and 1989， the cubic-spline function approach is applied. Itis shown that there has a population suburbanization in the studied areas， while three metropolitan areas dislpayed three different spa-tial structure patterns. To explain出e changing quantity of the population density， this paper using a quadratic function， to constitute a metropolitan spatial structure varying model， and find that income variable is a exlpanatory variable for metropolitan spatial structure change， and economic industry spatial changing quantity has no relationship with population density spatial distribu-tion changing on metropotan areas，and the policy implications of the explanations sholdd bε briefly discussed.