The paper took TM/ETM+ Landsat images in the year of 1986, 1995, 2000, 2001, 2002 and 2003 as the main
information sources and the scopes of Chongqing's construction land during each period were extracted automatically
and accurately. The space-time expanding of construction in Chongqing city for the past 20 years was monitored. And
then, the motive force mechanism was analyzed combining topographical information data and social economic statistics.
The result indicates: Although slope was the limited factor of urban expansion, there was no obvious correlativity with
expanding rate in certain ranges. the slope played role to development of city only within a certain period. Expansion
rate (y ) of construction land and the population growth rate (x ) present the relation of y = 1.8234x + 0.0763; The area
(y ) of the construction land in Chongqing city has close relation with the per capita gross national product (x ) with
coefficient correlation up to 0.9878, and they have a mathematical relation of y = 0.03x3-0.6852x2+34.987x+0.015 on
number value.
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