By view of water resource natural character, it is not only similar to the absolute imperfect of land resource having amount and location fixed, but also not similar to that of air.Water resource shows the character of comparatively imperfect in definite region and definite phases by society and economy development.The paper entirely analyzed essence models of water resource comparatively imperfect-node space comparatively imperfect,equal space comparatively imperfect,comparatively times imperfect,water user comparatively imperfect and technic-economic comparatively imperfect.The conclusion will offer to the theories and practicalities of water resource development,management and supervision.