To carry out the prolonged water intake assessment for construction projects，it is of great significance to implement the strictest water resources management system，to further implement the requirements for the reform of the state supervision and administration of water resources，to respond positively to the general tone putting forward by the ministry of water resources for strong supervision of the water sector，to promote the rational allocation and efficient utilization of water resources.At present，the ministry of water resources and river basin organizations have not issued the technical guidelines or guidelines for the prolonged water intake assessment.How to regulate the application process，how to grasp the focus and key points，has become a major issue to be resolved urgently in the current work.This article starting from the working background of the prolonged water intake assessment of the construction project，discusses the main contents and procedures of the assessment work，which is taking Jiangxi province for example.It points out the key technology of the prolonged water intake assessment work.And accords to the problems，putting forward related suggestions.