Normalizing land surface temperature to eliminate its uncomparableness due to the images acquired in different times, calculating the proportion of land use types in 2km×2km case as a token of the land use pattern, and take Harbin city as an example to study the spatial pattern and the rule of spatial-temporal changes of urban heat field distribution, and uncover the effects of land use types spatial pattern on the urban thermal environment. The results show that: Heat-island effect existed remarkably in the built up area of Harbin , and was swelled; the collectivity land surface temperature of Harbin city ascended. The mean values’ discrepancy of each land use type’s land surface temperature decreased; the function of build up area to heat-island effect boosted up; water’ s function of reducing heat-island effect weakened; spatial discrepancy of thermal environment became unconspicuous.