||Construction process simulation is becoming a general technique in managing design and construction processes in the western world (Hossain and Chua 2009). However, there is a paucity of records on its practical application in Hong Kong and in the Greater China. Thus, it still remains as a tool for generating academic papers within the academic arena. In Hong Kong, there is a plan to upgrade 45% of the existing 7,700 km of water mains, giving a total of 3,000 km of aged water mains to be replaced in the next couples of years. In managing this sheer amount of construction works, studying its productivity is of prime importance in order to complete the works on time and within budget. This study has applied one of the simplest simulation tools, Web-CYCLONE, to assess the productivity and explore ways to optimize it. The study reveals that Web-CYCLONE is user-friendly in assessing productivity. However, it has a number of shortfalls. For example, in running two consecutive programs, the system needs to be refreshed to renew the interface and trace the charts and diagrams generated. Besides, Web-CYCLONE has the limitation of inability in identifying the critical path of a project and thus the floats cannot be considered. Web-CYCLONE is also difficult in modeling projects with complex resource involvement.