According to the latest fishermen income statistics system stipulated by China National Bureau of Statistics, this paper analyzes the changes about fishermen's income structure between 2008-2013 in China. Through comprehensive computation model of grey incidence degree, we analysed the correlation degree about fishermen's income structure and fishermen's income in view of the rate differences and the absolute differences. We found the fishermen's family management income has the highest relevancy degree with fishermen's income. Based on the rate differences, the relevancy degree of fisehermen's property income is at the second place. Based on the absolute differences, the relevancy degree of fisheermen's wage income is at the second place. Through the analysis of the contribution rate and the traction from every part of Chinese fishermen's total income. We found that the contribution rate and traction offered by other household income to household business operation income are higher than that offered by fishery production income. It shows that the labour force of fishermen has obviously differentiated. The productive subsidy becomes the second element which affects fishermen income. The productive subsidy has the second relevancy degree with fishermen's income, the contribution rate and traction to fishermen's income. The traction of fishermen's wage income mainly came from the other industries, it means the low level of fishery employment and the low level of fishery industry wage. Fisheremen's rent of land-use right has the obvious negative impact to the increase of fishermen's property income, the cutting of fishing grounds restricts fishermen to increase their income.