The construction projects of water permit continuation is an important link of water license management and an important starting point to implement the strictest water management system. Through the case analysis of rational assessment of hydration for Xinyu Water Group Co., Ltd, this paper truly reflected the real water level and difference between the actual water intake and licensed water in the actual operation process.This paper provides some advices for water administrative departments to review the implementation of water permits and Whether to issue a new water permit.