Several important problems on the macrodevelopment of watersaving irrigation were analyzed and studied. From the point of view of the balance of supply and need of agricultural water, the relationship between the watersaving irrigation and the sustainable development of agriculture was discussed. For the general evaluation of watersaving irrigation systems, the technical connotations, the standard systems, and the beneficial systems were presented. The guiding principles and the key reasons to develop watersaving irrigation in our country were given.