Since 2017，the throughput of the coal port area of the Huanghua Port has continuously exceeded 200 million tons，and the trend of large-scale ships is obvious，which leads to a long waiting time for ship，and the throughput capacity of the channel cannot meet the development requirements of the port. Therefore，it is urgent to widen the current 50，000 DWT channel. In order to reasonably determine the channel widening scheme，we establish a port and channel system model covering anchorage，channel，harbor basin and berths by using the system simulation technology，and carry out simulation research on the multiple channel widening schemes combined with realistic data of port production. The results show that each channel widening scheme can meet the development requirements of port throughput. With the increase of channel widening mileage，average departure time of coal vessels and average empty berthing time of a single ship at the coal terminal show a decreasing trend，the berth utilization rate of the coal wharf and the throughput capacity of the port and channel system are gradually improved. Based on the simulation results，the channel widening scheme 1 is recommended by comprehensively comparing the factors such as investment，channel cross flow and later maintenance cost.