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With development of e-government systems, there are many big changes in Chinese government’s efficiency. However, the SARS revealed low efficiency is still serious. After the analysis of the factors affected on the efficiency, we find that traditional DSS is hard to support decision maker and that online support systems may improve the officials’ work effectiveness better. Unfortunately, little attention has been given to the research. In this paper, we will discuss the cultural characteristics of Chinese government. And then, based on the theory of Time-based Competition in governmental workflow, we summarize the four characteristics of online support systems. Furthermore, we propose the design framework for online support systems (OSS) in context of e-government in China, which consists of three major parts: the single OSS, the collaborative OSS and the mobile OSS. Also the detailed function and procedure of the three parts are presented. Analysis shows that the OSS contributes to developing efficiency in the official decision making.