Abstract: Land surface temperature is one of important parameters in meteological and ecological research field.Split window algorithm based on MODIS data was briefly introduced and applied in Tianjin area.Comparison between data retrieval and surface observation data showed that data retrieval could reflect distribution of land surface thermal field.Data retrieval correlates very well with the observation data(R2=0.38,P<0.0001).Linear fitting of different time series data can improve retrieval precision effectively.The results could provide technical support for urban heat island study.

Key words: Land surface temperature, MODIS, Tianjin, Split Window Algorithm