The Maritime Trade Office in Quanzhou was established in 1087 by the Song and Yuan regimes to manage the city’s maritime trade affairs. Its establishment marked the official designation of Quanzhou as a national port for foreign trade. The Maritime Trade Office was of vital importance to economic prosperity, cultural exchanges, and common development of all participants of maritime trade in Song-Yuan Quanzhou. It exhibits the unique attribute of Quanzhou as a port city underpinned by the enormous state apparatus. It is located on the bank of the Jinjiang River in the southern part of Quanzhou City, outside Zhennan Gate of Luocheng (“outer wall” of the old city of Quanzhou) and inside Nanxun Gate of Yicheng (“wing wall”). The ongoing archaeological excavation has uncovered Song-Yuan ground remains in two trial trenches. These two pavements may have been the ground of the same large-scale official building. Artifacts unearthed were mostly produced by local Dehua, Cizao, Dongmen and Nan’an Kilns. A few of them were products of kilns outside Quanzhou, such as Longquan, Yueyao, Jingdezhen and Jizhou Kilns. The unearthed fragments of Yuan-era egg-white glazed porcelain, decorated with dragon and flower designs, are remnants of high-grade porcelain, testifying to the high standard of the building complex. The findings show that there once stood a large-scale high-standard government building complex here. The extant ditch in the northwest part of the site has a 10 to 20-meter-wide underground silt layer on either side, revealing the scale of the historical waterway system. The Site of Maritime Trade Office was included into the ninth group of cultural heritage sites protected at the provincial level by Fujian Provincial People's Government in January, 2020.