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 better 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．