This paper has dealt with the evaluation indices and factors of urban gardening and greening, analyzed the requirements of the system, designed the function and structure of Kunming gardening and greening management information system based on GIS, explained the reasons for the appearance of polygon fragments in the urban gardening and greening data, proposed the solution of the polygon merger and achieved the automatic merger of polygon fragment. According to the classification criteria of urban greening and China's urban gardening and greening indices, the authors have realized the calculation of three indices of Kunming greening programming, urban gardening and greening classification and the data updating.