中文摘要：

在系统考察广东省徐闻县农业基础建设制度变迁的实践基础上，文章揭示了其制度变迁的逻辑核心在于追逐灌溉之利，其内在动力在于农民自发逐利、社区精英协同与地方政府助民成利三股力量的契合；进而，文章指出农民经济自由权利和生产赢利空间的扩大是农业基础建设长效机制形成的根本，有助于形成稳定收益预期的制度安排，将激励农民对农业基础设施建设投资的积极性和利用效率，而乡村集体行动制度供给力量则决定着制度变迁的时滞和经济效率。这也正是“徐闻实践”蕴涵的独特理论价值和现实借鉴意义。

英文摘要：

This paper revealed that the core-logic of the institutional changes lay in chasing irrigation profit, whose internal power lay in the integration of three forces, the farmers ＇spontaneous pursuit of profit, community elite＇s participation and the economic incentive from local government, based on the systematic investigation on the agricultural infrastructure institutional change in Xuwen County in Guangdong Province. Furthermore, the article pointed out that the enlargement of the economic freedom of peasants and the profiting sources of production were the bases for the formation of sustainable mechanism of agricultural infrastructure construction, which would be conducive to the formation of stable profit expectation and meanwhile encourage farmers to the investment of agricultural infrastructure and improve its utilization efficiency; however, the supplying force of rural collective action system restrained stagnancy of institutional change and its economic efficiency. This was the unique theoretical and practical value which ＂Xuwen Practice＂ contained.