According to the irrigation water loss,rainfall,groundwater recharge and groundwater exploitation in Hetao irrigation district,a generalized model of groundwater balance was established under the condition of ensuring the balance of groundwater recharge and discharge,the reasonable ratio of canal and well area was studied,and the sensitivity of main parameters was analyzed.The results showed that the ratio of canal and well area in canal-well district should be controlled around 2.5 to 3.5,and the impact of...