Abstract:The shore power is an effective way to reduce pollutant emissions in ports,and is an inevitable requirement for the development of green ports. From the perspective of the supply chain, the game models between port and ship using shore power are constructed under government subsidy policies.The reduction decision of the supply chain and the subsidy strategies of government are analyzed in three cases:ship is the dominant?player; port is the dominant?player; port and ship are both the dominant?players. The results show that, the subsidy where the port and ship are both the dominant?players is the smallest. When the shore power connection time is short, the overall profit of the supply chain where one party is the dominant player is the largest. When the shore power connection time is long, the overall profit where the port and the ship are both dominant player is the largest . The emissions and social welfare in the three power structures are the same.