龙眼是我国南亚热带特产水果，因其栽培历史悠久，果农沿袭传统的栽培方法，建园和管理较为粗放，品种结构尚欠合理。在持续高产、稳产及品质改良方面难以取得突破，迫切需要有关农业专家的系统技术指导。专家系统是一种计算机系统，它依据存储于计算机中的专家知识和经验，结 Longan is a specialty of South Asia tropical fruit, because of its long history of cultivation, fruit growers follow the traditional cultivation methods, construction and management of more extensive park, breed structure is still not reasonable. Difficult to achieve breakthroughs in sustained high yield, stable production and quality improvement, there is an urgent need for systematic technical guidance on agricultural experts. Expert system is a computer system, which is based on stored in the computer expert knowledge and experience, knot