Trading Margin is the self-owned funds that investors need to pay when financing to buy securities in the securities market.

The role of the transaction margin is to abide by the market rules and the commitments agreed in the transaction as the main body of the property right transaction, and to serve as the economic guarantee to compensate the relevant subjects when they violate the rules.

The bidding transaction of central grain reserves also needs to pay the corresponding deposit, generally 5 yuan. After the transaction is completed, the deposit is paid to the trading center as a handling fee.