In recent years, Taiwan’s water resources are seriously deficient, the characteristics of high mountains and rapid rivers, and the dramatic changes in the weather have caused the overall utilization rate of rivers to be too low, and the reservoir water storage capacity has decreased. Therefore, if water resources are to be better utilized, irrigation water needs to be saved. In order to carry out appropriate irrigation in response to the cultivation of diverse crops, the amount of irrigation water can be controlled with the characteristics of crops, and environmental factors. This thesis intends to solve the problem that waste of water and crop roots withered by using precision irrigation techniques.