Abstract: Abstract: Planning can guide the construction of the modern agricultural demonstration zone（MASZ） in high level. A scientific guiding theories system may smooth the process of the planning and its appliance. Based on the characters of the modern agriculture, we try to establish such theory system by summing up relevant theories using the hierarchical classification method. This theory system includes theories about site setting, development definition, general arrangement, industry development, location, industry planning, science & technology supporting, profit analysis, innovation of the mechanism, etc. The overall design is an important part of the MASZ planning, which mainly summed and integrated the basic theories about development definition, location, industry planning. In guiding the development definition, there are mainly theories about the basic role of agriculture and about multi-functions of agriculture. In guiding the general arrangement, there are theories about system engineering and recycle agriculture. In guiding the industry development, there are theories about major industry choosing, industry chain, industry construction. In guiding location, there are theories of growth pole, core & axis, agriculture districts division. The practice of this guiding theories system is showed in the case of The Planning of the Agriculture Demonstration Zone of Haikou City. In this planning, we defined the function of Haikou MASZ by considering such factors as strengthening the local industries, efficiently supplying of vegetables, developing low-coal agriculture, leading zone development, improving the international competing advantage, attracting tourists, etc. According to theory of system, we designed a positive cycle system, in which, agriculture products processing is as engine, technology innovation is support factor, social agriculture service is associate factor, all industries react and coordinate well. The major industries were chosen according factors as resources, scale of industries, market, technology level, industrialization level, profit and sustainability, etc. According to the theory of districts division, the zone was divided into three cores, three belts, four zones and five parks.