Abstract: Based on the method of tracking the seeding coverage in artificial precipitation enhancement by antiaircraft guns, this paper presented ideas of selecting the equal-area concentric rings around the seeding coverage as the contrast area, raising the new physical assessment for artificial precipitation enhancement and giving adaptive judgment index. Calculated the gap of every physical quantities between " the seeding coverage " and "the contrast area" by double ratio and relative deviation and so on during different durations in different type of natural precipitations with selecting vertical integrated liquid water (VIL) and the area precipitation as test factors; Showed the scope of the new assessment and the specific situations in which the gap of every physical quantities between " the seeding coverage " and "the contrast area" were same as or less than that in artificial precipitation enhancement with considering similar dispersion as indicator .The results showed that in different type of natural precipitations ,the average gap of vertical integrated liquid water in 30 minutes and the area precipitation in 3 hours between " the seeding coverage" and "the contrast area" were less than that in artificial precipitation enhancement. At the end of the article a concept of compensation coefficient of comprehensive similar dispersion was presented, which was perceived as a criterion of the new assessment to decide the new assessment would be adopted when its value was less than 0.2. Obviously, the addition of criterion greatly improved the the effective evaluation.