The economic development pattern of county area is a distinctive developing process and path which gradually formed in the process of constantly industrialization and modernization of county economy. Referring and selecting right development pattern play an important role in constituting the strategy of economic development pattern in county area, improving the efficiency of economic development in county area, and helping economic development in county area free from predicament. Starting from perspective of economic development pattern in county area led by three major industries, some counties in Liaoning Province are taken as examples, models are established by applying BP artificial neural network, and appropriate development patterns in developing process are selected for each county area through computer simulation, so as to promote the well-off economic development in county area.%县域经济发展模式是在县域经济不断工业化与现代化进程中逐步形成的一种具有特色的发展过程和路径。借鉴并选择正确的发展模式，对于制定县域经济发展模式战略、提高县域经济发展效率、帮助县域经济发展走出困境起着十分重要的作用。从三大产业主导的县域经济发展模式视角人手，以辽宁省部分县域为例，运用BP人工神经网络构建模型，通过计算机仿真帮助各个县域在发展过程中选择适合的发展模式，从而达到促进县域经济顺利发展的目的。
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