根据考古调查，目前发现岛上城墙共计198段，长约6公里，由外城墙、内城墙、一字城墙和墩台等组成，均为夯土甃石结构。外城墙1350米，长期淹没于水下；内城墙位于皇华岛顶部，城圈基本闭合，围合面积约57万平方米。另有南北两段一字城墙，均上接内城墙，下接墩台，加强了内城、外城、城址与长江的联系，扩大了城址纵深防御的功能。初步确认西南陶家嘴至柳家河段为城址防御的重点。遗址内出土了青瓷、白瓷及黑釉瓷片等宋代遗物。
According to archaeological investigation, a total of 198 sections of city walls have been discovered on the island, with a length of approximately 6 kilometers. These city walls, all made of rammed earth and paving stone structures, are composed of outer-city walls, inner-city walls, straight-line city walls, and abutments. The outer-city wall measures 1350 meters in length and has long been submerged under water. The inner-city wall is located at the top of Huanghua Island and forms a nearly enclosed circle with an area of approximately 570,000 square meters. There are also two sections of straight-line city walls in the north and the south that connect to the inner-city walls from above and to the abutments from below. They have not only strengthened the connection between the inner and outer cities as well as between the city site and the Yangtze River, but also expanded defensive capabilities in depth for the city site. It has been preliminarily confirmed that the section from Taojiazui in the southwest to Liujiahe is a key defense point for this city site. Artifacts from Song Dynasty such as celadon pieces, white porcelain pieces and black-glazed ceramics have been unearthed at this site.
