In this paper,system analysis method is applied,a model of optimal conjunctive operation of surface water and groundwater resources for Fuyang, Huaibei district is established.

Based on the lacking of water-saving evaluation system in well-canal combined irrigation patterns region,fuzzy synthesis evaluation technique were used,synthesis evaluation system and assistant decision-making system by computer were developed.

Based on the dispersible irrigation water resources,lower irrigation water efficiency,agricultural water resources shortage,and severe environmental problem in Weihai well-canal combined irrigation patterns region,the pipeline net project of multi-water resources and the optimal schedule of water resources were used in this area.

In the light of the problems existing in well-canal combination irrigated area such as the recession of groundwater and the shortage of usable water quantity, this paper advances various methods that were used for several years for the well-balanced adjustment on water resources.

The development of defensive measures and the progress of defensive abilities reflect in four aspects: defensive measures of "making the best use of land",grain reserves of fair deal for famine,defensive project against disaster such as canalizing and irrigating,and defensive measures against flood such as damming and planting.

A large number of earth canals in the countryside attract Chinese central authorities and local governments great attention for its agricultural development.