《天盛律令》是11-13世纪西夏政权的一部成文法,其中对于水利制度的记载相当完备,前人对其制度的内容已进行过相关探讨,但未从制度渊源上进行过深入研究。本文认为,西夏水利法之所以能有如此详细完备的规定,其中很重要的原因就是继承了中原法体系之内容,尤其与唐律、令、《水部式》等所规定的原则与制度高度相仿,部分条文也深受自中古以来河西制度的影响和传承。 “Tiansheng Law Order” is a written law of Xixia regime in the 11th-13th century. Among them, the record of the water conservancy system is quite complete. The predecessors have made some discussions on the contents of its system, but did not conduct any further research from the origin of the system. This paper argues that the reason why Xixia Water Law can have such detailed and complete provisions is very important because it inherits the content of the Central Plains Law system, especially with the principles and systems stipulated in Tang Law, Order and Water Ministry Similarly, some articles are also deeply influenced and inherited by the Hexi system since the Middle Ages.