Abstract: With in-depth development of government procurement, some problems occur gradually in its credit system, such as the loss of credibility, the low degree of openness and sharing of credit information, the increased security threat of credit information, the poor effect of credit supervision, and the obstruction of the implementation of disciplinary policies for dishonesty. The application of block-chain technology in the construction of government procurement credit system is conducive to providing a safe information environment, facilitating multi-subject participation and multi-center cooperation, and promoting diversification of credit supervision. This paper recommends some application paths of block-chain technology in the construction of government procurement credit system: 1. to re-frame the credit management foundation of government procurement credit system with block-chain concept; 2. to improve the credit information disclosure and sharing platform with decentralized trust mechanism; 3. to build multi-agent supervision participation mechanism with distributed ledger structure; 4. to achieve intelligent credit evaluation with intellectual contract mechanism.