| The studies mainly focus on the evolvement and impact factors of farming system about 50 years in Tianjin city. The author makes good use of all kinds of ways such as statistic analysis, typical survey, specialist interview and mathematic model to analyze this issue, and also, predicts the developing trends of farming system in 2020 based on the analysis and put forward some countermeasures.1. Established the zoning of fanning system in Tianjin cityBased on the comparative analysis and synthesized study, the author newly make sure orientation about outskirts city agriculture cultivatable area, Binhai cultivatable area, plain synthesized agricultural cultivatable area in the middle of south and the function of environment agricultural cultivatable area in north, and take an idea of district agriculture development about "city agriculture circle, Binhai industrial section, synthetical agriculture section in the middle of south and environment agricultural area "----"a circle, two belts and a section ".2. Systematically studied the evolvement rules of fanning system from 1949 to 2003 in Tianjin cityAs the improvement of farming system in Tianjin , the structure of plants ,agriculture and rural china have been adjusted and improved since 1949. Cropping index enhances from 105.48% to 149.23%,then reduces to 119.8%,and has a steady increase trend in resent years. Crop distribution has a specialization and area coverage trend, and generally comes into being facility vegetable area, cotton and grain planting area; planting mode has a diversification trend, and land productivity increased further ;rotation decreased further , durative rotation area and time added; crop output increased greatly by means of using new breed, Facility agriculture and information technology.The proportion of crop drops 39% in the interior of farming, the level of food self-support drop to 24.41%,but that of economic plant rise 37% and crop, vegetable and cotton rise 4,23 and 16.6 times, urban and rural city food-grain consumption rise 80.54% and 38.03% in Tianjin ,based the long-term change trend, author think that foodstuff should be kept in the rational range of 20%-40% in Tianjin. The internal agricultural structure was optimized generally, the proportion of agriculture go down 43.99%,but that of stockbreeding and fishery go up 32.63% and 9.1 l%,and forestry steadily rise.Rural industrial structure was also optimized generally , GNP in rural China rise 100 times, Domestic first industry ,domestic second industry and service industries structure were adjusted from 42.59:53.02:4.39 to 8.01:74.03:17.96.Numbers of Rural Laborers rise 17.59%, thereas, that of Domestic first industry drop 23.3%,but that of domestic second industry and service industry rise 16.88% and 6.34%; Farmers' average net income increases 129.24 times.The basic evolvement law of farming system in Tianjin is as follows:The general law of the agricultural structure adjustment in big city is that city spread and increasing demand for urban and rural people's living as declining natural resource, reducing grain area, increasing economic crop (the proportion of Domestic first industry and agriculture decreased), descending the supply of grain, ascending the supply of meat, egg and milk, reducingagricultural labor force ,promoting the economical effects (per mu tilth production value, labor production value, per capita income), promoting of the agricultural diversification and rural pluralistic structure, integrative urban and rural development; Diversification demand in urban development is the main impetus for the adjustment of fanning system. To Promote the agricultural sustainable development and increasing the farmers' income is the core for farming system reform and development. Agricultural policy and technology is the basic guarantee for farming system development.3. The analysis on the influence factor to the evolvement of farming system in TianjinThe evolvement of Tianjin's farming system has been influenced by a lot of factors such as city development, condition for pr...
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