Based on the review of the site selection and planning of Yangshan deepwater port, we find out that Yangshan deepwater port has unique geographical advantages, good natural conditions and considerable economic benefit and good social benefits. According to the variation of the seabed deposition and erosion after completion of the north harbor district, through comprehensive analysis based on the numerical simulation,physical model test and navigation simulation technology, we conclude that the half-branch scheme is safe and reasonable for the north harbor district of Yangshan deepwater port. Suggestions on the overall planning of Yangshan port are also given.