只有正确客观地认识森林水文效应，才能在实践中实现其指导意义。论文从森林与水的关系入手，提出要确立系统观。以我国各生态定位研究站及其他同类研究项目的多年研究结果为基础，系统客观地分析和阐述了森林生态系统与水分循环的关系以及森林在各方面的综合调节功能。提出在西部开发中林草植被建设要考虑到水资源的科学分配；要在保证生态安全的前提下，所有产业“适度发展”。

 Only by understanding forest hydrological effect accurately and objectively can we get right direction from these principles． This paper proposes using systematic viewpoint to deal with the relationship between forest and water． Comprehensive adjustment function of forest and the relationship between forest and hydrologic cycle are stated and analyzed systematically depen ding on the long term research results of fixed ecological stations throughout China and similar research projects． It raises that in the development of western regions of China， scientific allotment of water resources should be considered in construction of forest grass vegetations and all industrial development should be moderate．