Abstract: In order to avoid possible problems such as "false insurance policy", the sales process of aviation accident insurance urgently needs traceability management. Aimed at the weak links of insufficient performance of single-layer blockchain and low efficiency of constructing traceability records, a multi-layer blockchain traceability model STAM (source traceability agent model) is proposed. While realizing enterprise privacy isolation, the performance of data traceability was improved. Provenance data model was integrated to describe traceability records, and using smart contract to combine the records of all links in aviation accident insurance sales into a complete chain. The comparative experimental results show that it effectively improves the traceability performance, has low transaction delay, and has high security and scalability.