Abstract: Based on modified Interbrand brand value evaluation method, by calculating expected income, brand multiplier, brand strength and discount rate index of Yantai ChangDao Beicheng Fishery Cooperative, brand value of the cooperative was finally calculated．It can be seen that brand development potential of geographical indications agricultural products was great．It can bring huge benefits to cooperatives and even local agricultural products industry．Further, value and existing problems of agricultural cooperatives in brand construction was summarized, and relevant countermeasures were put forward, in order to be beneficial to brand construction of marine ranching．