Abstract: It is very important to deal with the progress uncertainty of tasks in project managements. Present project management software cannot intuitively represent the uncertainty of the project task progress and the cooperation relation of individuals. A visualization method for visualizing task time schedule uncertainty is proposed by using uncertainty glyphs combined with a timeline method. This paper first summarizes the characteristics of task progress uncertainty, further gives a specific definition of progress uncertainty and proposes a progress uncertainty model. Then the timeline method is employed to visualize the overall process of projects, and uncertain visualization glyphs are designed to represent task progress uncertainty. Furtherly the model can provide users with a variety of interactive means and multiple views to help analyze the progress uncertainty of the project task and staff collaboration, provide multiple color schemes according to the user＇s color perception preferences. The software developing management is taken as a case to verify the validity and practicability of our method in Program Line visualization system.