Abstract: This paper improves the traditional method of land use dynamic change spatial analysis and analyzes land use TuPu spatial-temporal change based on the Geo-information TuPu theory. With the example of Baoqing county of Sanjiang plain, it analyzes the regional different land use change process and change modes based on expanding, shrinking, disappearing, appearing and resurging from 1954 to 2000 depending on the land use spatial data from 1954,1976,1986 and 2000. In conclusion, the regional cultivated land increases 451197.65hm2 from 1954 to 2000. Wetland reduces 263122.5 hm2 from 1954 to 2000. The cultivated land increase engrosses lots of grassland and wetland; the woodland decreases except from 1954 to 1976;the village and town construction expands. Land use entities expanding and shrinking mainly happen the borderline of the big entity units. The entities of disappearing, appearing and resurging are mainly the small entity units. By analyzing modes of the land use change TuPu, we conclude that man activities reclamation leads to cultivated land increasing and wetland dropping. The regional ecological environment is worsening and biodiversity is decreasing. At the same time, the regional ecological interfaces are changing.

Key words: land use change, TuPu, spatial analysis, Baoqing county