This paper analyzes the current situation and development trend of Shanghai Port, channels and ports along mainstream waterway of the Yangtze River, which signifies the necessity of the construction of the new port for Shanghai. On the basis of analysis of the relation between new port and main port areas peripheral, the function of the new port is proposed, along with the preliminary planning of Shanghai new deepwatar port, including layout of the port and approach channel, function division, shoreline plan, land area, throughput capacity, etc. According to the evolution rule of the Yangtze River Estuary, combined with numerical simulation of tide, wave, sedimentation, etc, the feasibility of Shanghai new port is analyzed, with the proposition of the relevant problems in the harbor planning process.