中文摘要：

根据笔者建立的可变集及其辨证法基本规律数学定理，提出事物相对差异度演变定理和可变集模式识别矩阵，在此基础上提出水资源系统可变集评价原理与方法。列举了广东省东莞市4个水平年水资源可持续利用协调程度评价实例，并与模糊集对评价法进行了比较与分析，指出该法存在的问题与错误。实例与比较表明，以可变集理论为基础的水资源系统评价原理与方法，具有理论严谨、概念清晰、计算简便的优点，可以推广应用于环境工程、水利水电工程、土木建筑工程、管理工程等众多学科的多指标（目标）评价领域。

英文摘要：

The theorem of the relative differences evolution, which is based on the theorem of variable sets and mathematical laws of basic laws of dialectics, is introduced in this paper. It also introduced the pat- tern recognition matrix and evaluation principle and method for water resource systems with the former sup- portive effects. An evolution on the coordination in four planning level years for the sustainable use of wa- ter resources in Dongguan city, Guangdong Province is taken as an example and demonstrates some compar- isons and analysis between variable sets and set pair analysis are demonstrated. Then it points the prob- lems of set pair analysis. From the comparison and analysis, it shows that the evaluation principle and method for water resource systems that based on the variable theory have more advantages. With much rigor- ous theory and clear concepts, the calculation is much more simple and convenient. The method this arti- cle introduced can be extended to many academic fields including： environmental engineering, hydraulic and hydro-power engineering, civil and architectural engineering, management engineering, etc. It has a very broad application prospect.