Abstract: The objective of this paper is defining the term of agricultural water resources security, its connotation and extension. The definitions of water security, water resources security and water environment security were summarized, and their relations were differentiated and analyzed. Based on these, the elements of the conception of agricultural water resources security were hashed and the conception was defined. Agricultural water resources security should be that water resource provision ensures agriculture against threat, hazard, harm and losing. Moreover, the connotation and extension of agricultural water resources security were ascertained. In detail, the connotation of the definition has natural attributes, socioeconomic attributes and human cultural attributes. The extensions include broad and narrow sense, as well as, food security, agro-environmental security, agro-economic security, rural society security, etc due to agricultural water resources security. The definition will be the frame of reference for developing the researches, limiting the frame of the theory, and founding a appraising system for agricultural water resources security.

Key words: Security, Water resources, Water environment, Agriculture