Based on the sea petroleum hydrocarbons in XXXX changing seasons and distribution was According to the topography and industrial area XXXX distribution characteristics of nine sites, were respectively in the spring, summer, autumn and winter seasons of oil content of track Using state standard test method for water quality oil content determination, comparative analysis of the measurement Results show that: the sea oil content of changing seasons XXXX obvious, comparison results for the summer (1972 mg/L) > spring (1085 mg/L) > winter (0745 mg/L) > autumn (0611 mg/L), The sea oil content of hydrocarbon XXXX planar distribution is gradually decreased from inside the trend, and the western industrial oil content XXXX dock in eastern culture zones, General situation of petroleum hydrocarbon sea for different content of each are not identical, belong to different water quality standards, nine in five seasons, site sites average oil content is higher, the autumn and winter of the Ⅲ belong to the state standard of sea water, spring, summer Ⅳ belong to the state of the sea water quality standards, Nine seasons average oil content sites with low, belong to the state of the sea water quality standards Ⅱ, The site is an average of four seasons between 05 mg content of oil/L and 30 mg/L, belong to the state of the sea water quality standards Ⅲ