Abstract: In order to research the scale economic effects of pelagic fishery enterprises so as to promote the development of pelagic fishery enterprises in China, empirical analysis was conducted using the input and output data of 3 listed pelagic fishery companies within 30 years. And scale economic efficiency and comprehensive technological efficiency were calculated by utilizing the model of data envelopment analysis. The results showed that the overall coefficient of scale economy of pelagic fishery enterprises in China was relatively high while the effect of scale economy hadn’ t been brought into full play. At the same time, comprehensive technological efficiency of pelagic fishery enterprises was relatively low, which was not good for the enterprises’scale economy and formed restriction to the production and operation efficiency of enterprises. The labor costs of pelagic fishery enterprises were high, the labor input was surplus and the structure of input factor was unreasonable. By analyzing the non- DEA efficient unit, the paper put forward the direction and improvement ways for pelagic fishery enterprises to reach efficient DEA.