The types of ancient commercial contracts in China mainly include

Loan contract, sales contract, lease contract, etc.

1. Loan contract: The loan contract in the Han Dynasty mainly protects the interests of creditors from losses. It is stipulated that the debtor shall bear legal responsibility for failing to repay the loan within the time limit.

2. Sales contract: The sales contract in Han Dynasty is called "certificate book". In order to establish business relations, the contract should be made in duplicate, one for the buyer and one for the seller. In case of disputes in the future, the contract shall be taken as evidence.

3. Lease contract: In ancient China, the lease contract was a common type of commercial contract, which stipulated the rights and obligations of both parties, such as rent, lease term, use and maintenance of the leased property, etc.