This study compiled the data of ^239+240Pu specific activity, ²⁴⁰Pu/²³⁹Pu atom ratio and ^239+240Pu flux or inventory in the East China Sea and adjacent waters. Based on the ^239+240Pu concentration in atmospheric fallout, ^239+240Pu in seawater, ^239+240Pu in organisms, ^239+240Pu in sediment trap and ^239+240Pu in sediment, the geochemical behavior of ^239+240Pu were explained in the East China Sea and adjacent waters. The results showed that global fallout and Pacific proving grounds close-in fallout were the two major sources of ^239+240Pu. Under the influence of water masses such as the Changjing River diluted water, Zhejiang-Fujian Coastal Current, Taiwan Warm Current, Kuroshio Current and upwelling current, mixing effect and removal effect, the concentration of ^239+240Pu in coastal waters of the East China Sea showed a trend of removal over time, the burial depth of ^239+240Pu in the near shore sediments was deeper than that in the far sea area. In the northeast of Taiwan Island of China, the ^239+240Pu specific activity and ^239+240Pu inventory in Okinawa Trough increased significantly under the influence of Kuroshio current intrusion and upwelling current. At the same time, this study found that the relationship between ^239+240Pu specific activity and ²⁴⁰Pu/²³⁹Pu atom ratio in surface sediments of the East China Sea, and confirmed the existence of a tributary of the Kuroshio bottom in northeastern Taiwan, and indicated the location where the Taiwan Warm Current and a tributary of the Kuroshio bottom may intersect.

^239+240Pu  /  ²⁴⁰Pu/²³⁹Pu  /  East China Sea  /  sediment  /  seawater