According to the samples of oil spills loss data from ships in China, this paper considers to separate the data into the main part and the tail part, and constructs a doubly-truncated distribution - GPD (DTD-GPD) model to model the two parts of the loss data. The results show that the loss data of oil spills from ship are not normally distributed but has a“sharp peak, heavy tail”feature, and the DTD-GPD distribution fitting effect is better than the traditional distribution.