Based on three important parameters such as weight of hydrological zones (HZ), depth to water (DTW) and rate of rise(RR), a hydrological response units (HRU) map 2001 was created in the Tao’er River basin, Songnen plain, which can response sensitively to the spatial change of groundwater environment, and it is produced by the algebraic multiplication of the three classified grids: HRU = DTW*RR*HZ.

Determining the sub-region weight coefficient is a complex and important task in optimal allocation of regional water resources.

This paper sets up a unascertained comprehensive evaluation model on index distinguish weight,we applied the model further to evaluate the water pollution of Fuyang River comprehensively.

To make the solution be more flexible, an interval weight vector is obtained, which is achieved through linear programming method in this paper.

In this paper, a new method for the calculating weights in the uncertain interval judgment matrix is proposed, and the interval weight of alternatives are obtained by solving a program problem.

The weights of the four factors are evaluated with the method of interval weight and finally the paper uses the decision theory to determine which route should be chosen in multi-modal transportation.