Recently,frequent occurrence of extreme weather and climate events had caused serious impacts on people’s production and livelihood,so the extended-range weather forecast attracted more and more attention. With the national spread and promotion of the low-frequency synoptic chart,extended-range synoptic processes forecast was developing vigorously throughout the country. To bet-ter satisfy the service need of synoptic processes forecast,an on-line displaying system associated with the extended-range synoptic processes forecast was developed in Zhejiang Climate Center. In this paper,the design philosophy,detailed structure,and the thoughts of future improvement and optimization were introduced extensively. The on-line displaying system included two columns,i. e. ,the heavy rainfall processes and the intensive air-temperature reduction processes based on different objects of forecast. The column of heavy rainfall processes consisted of the figure comparing between forecast and the actual state,forecast document,table of dynamic scores,table of brief description of the realistic observation,and table of detailed description of the realistic observation. The contents of intensive air-temperature reduction processes column were similar to that of the heavy rainfall processes,but the table of dynamic scores was omitted. In the future,the system will receive more improvement and optimization through designing more suitable indices and establishing the marking scheme for intensive air-temperature reduction processes and expanding the components of extended-range synoptic processes forecast.%近年来极端天气气候事件频发，对人民生产生活造成了严重影响，延伸期天气预报得到了空前的重视。随着低频天气图方法在全国的推广和普及，延伸期天气过程预报在我国各地得到了蓬勃开展。为了与过程预报的服务需求相适应，浙江省气候中心设计研发了延伸期天气过程预报在线展示系统。本文从设计思想、系统架构、未来设想3个方面对在线展示系统进行了详细介绍。该系统立足于以预报对象为导向的原则，设置了强降水过程和强降温过程2个栏目。强降水过程栏目涵盖预报与实况对比图形、预报文稿、动态评分表格、实况简述表格、实况详述表格5部分内容，强降温过程栏目展示内容与强降水过程栏目类似，但不包含动态评分表格。未来拟从强降温过程指标判别的合理性、强降温过程评分方案、拓展预报体系3个方面对系统功能进行改进和优化。
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