The combination of blockchain and supply chain is a popular research topic in recent years. The advantages of blockchain such as data traceability， tamper proof and distributed storage can guarantee good data security for supply chain， while the autonomy property of blockchain also provides possibility of supply chain autonomy. The autonomy of blockchain mainly depends on consensus mechanism， but the existing consensus mechanism is difficult to realize good support for supply chain autonomy. To solve the above problems， an election-based consensus mechanism based on Delegated Proof of Stake （DPoS） was proposed， and on this basis， a self-made framework of supply chain based on blockchain was constructed， namely Election-based Supply Chain （ESC）. In ESC， the credit score of a node was first calculated according to the smart contract activities participated in by this node. Then， from the perspective of game theory， the influences of node active degree and credit score on stake under ESC were analyzed. Finally， theorem proving and simulation experiments verify that the proposed mechanism has a good incentive effect on nodes and can effectively inhibit the maximum transaction cost paid by rational nodes，and the inhibition increasing with the increase of the number of delegates.