Aiming at the difficulty of demonstrating the construction scale of construction temporary channel under the environment of the complex interaction between dredgers and merchant ships in the course of waterway construction，we apply the computer simulation research method，establish a temporary channel simulation model based on the Flexsim simulation platform combining with engineering cases，simulate the entire process of channel dredging and reclamation works，and analyze the influence of construction scale of the temporary channel on the schedule through model experiments. The results show that the construction scale has a limited influence on the schedule for the construction temporary channel with a short length and low density of ship flow，and the scale of mud storage area and reclamation station is also an important factor in the schedule.