Abstract: As the number of ships continues to grow, the quantities of goods carried and the distances of ship traveled have made the sea ambient noise level dramatically rising, which impacts on the marine environment increasingly worse. Moreover, the ship history database can not reflect the real situation and is no longer applicable. Especially for the pelagic ships, there is a shortage of data available. With the aim of palliating this situation, this paper puts forward a data fusion method of multi-source AIS, which can get the every hour distribution of ships and then calculate the regional ship noise level for sound mapping.