The thesis analyzes the role of small-and-medium-sized enterprises of county in promoting county economy: the small-and-medium-sized enterprises of county become the material basis of developing production and boosting county economy; the small-and-medium-sized enterprises of county become the main channel of increasing farmers’ job opportunities and realizing affluent life; the development of the small-and-medium-sized enterprises of county become the propeller of development of urbanization and county economy; the development of the small-and-medium-sized enterprises of county creates excellent conditions for the construction of modern agriculture. The thesis indicates that the low level of county industrialization is the principal factor impeding the county economy of Shaanxi Province and it also analyzes the opportunities and challenges when quickening the development of county industry. The countermeasures of developing small-and-medium-sized enterprises are put forward as follows: raise the awareness and determine the concept of using industry to make county powerful; build scientific planning and outline of county enterprise development to propel the innovation of developing and operating system of county enterprise; create beneficial conditions and reinforce the degree of county enterprise support entrepreneurship; take the park construction as vehicle and reinforce the degree of attracting investments from overseas; take the autonomous innovation as the impetus and develop the recycling economy; improve and optimize the service environment so as to create an excellent investment environment for enterprise.