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In order to acquire tea plant water requirement precisely and achieve tea plantation precision irrigation control, the distributed precision irrigation control system based on wireless sensor network for tea plantation was developed, and the system architecture, hardware configuration and software design approach were also introduced in detail. According to the characteristics of many wireless sensor network nodes highly dispersed in tea plantation, two kinds of distributed irrigation control methods applied to different scale tea plantations were proposed, and the hierarchical irrigation controller composed of fuzzy controller in the lower layer and optimal controller in the upper layer was designed. The developed system with distributed hierarchical irrigation controller can realize tea plantation precision irrigation control and satisfy the certain irrigation performance index. Preliminary experimentations indicated the rationality and practicability of the system. It can be effectively applied to the large scale precision irrigation areas, such as the cropland, the orchard and the nursery garden, etc.