The approach channel in the core area of Ningbo-Zhoushan Port has been saturated in stages. For the construction of terminals for very large vessels in the core port area，it is necessary to carefully analyze the carrying capacity of the channel and the inherent safety level of the berths. Taking the construction of three new terminals for the 300，000 DWT very large crude carrier（VLCC）in the Jintang port area as an example，this paper analyzes the carrying capacity of the channel for VLCCs in the core area of Ningbo-Zhoushan Port using the theory of tidal windows. Moreover，it explores the requirements for the net spacing between VLCC berths using ship maneuvering simulation. The study draws the following conclusions：1）The channel carrying capacity of Ningbo-Zhoushan Port could bear the traffic pressure brought by the addition of three 300，000 DWT VLCC terminals. 2）It is recommended that the net spacing between adjacent large berths should not be less than a ship’s length.