In recent years

many middle/small cities grow up rapidly

which greatly spurs the economy devel-opment in Southeast China. However

the deterioration of environment it causes has had obvious impacts on the economy to continue to grow

and a threat to survival surrounding of people in the area.Therefore

the TIN pollution load in the Xikou basin of Southeast China is estimated using the L-THIA (Long-term Hydro- logical Impact Analysis) model and integrated GIS technique. The spatial distribution of the TIN pollution load is simulated and displayed. The result is visualized so that the simulating is easier to understand and is more helpful in the prevention of pollution and making control measures for the basin.