This paper attempts to put forward a theory that advocacy planning could reduce the social risk in the planning decision making which is significant to the domestic urban planning field. The description of urban planning vision fulfillment is critical and which is the key issue of advocacy planning decision making. Based on this theory, this paper sets up a group of correlation function model to describe the planning vision fulfillment index with the help of Extenics theory. According to the practical situation, it demonstrates the model and creates the curve after the introduction of the model theory and the intervals, further more, this paper inquires into the flow chart of Extenics advocacy planning decision making based on the model.%探讨了在我国城市规划领域推行倡导式规划的意义,认为倡导式规划有助于降低城市规划决策中的社会风险；提出了倡导式规划决策的核心问题,并认为城市规划愿景达成度的描述对于制定倡导式城市规划决策是至关重要的.为建立城市规划愿景达成度模型,引入了可拓学中的关联函数公式；结合城市规划领域的实际情况,介绍了公式的涵义和取值区间；在阐释了模型原理之后还进行了模型演示和曲线绘制.基于城市规划愿景达成度模型,进一步讨论了倡导式可拓城市规划决策的流程等相关内容.
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