Network transaction system for network transaction platform and transaction platform server

The invention provides a network transaction system for a network transaction platform. The network transaction system comprises a transaction platform sub-system, a service charge sub-system, an incentive fund sub-system and a seller client terminal, wherein the transaction platform sub-system calculates service charge data as per the predetermined service charge ratio for the transaction fund of each transaction and sends the service charge to the service charge sub-system; the incentive fund sub-system calculates the seller payment proportion of the sum of the service charges corresponding to all transactions of each seller within a predetermined period in the total service charge within the predetermined period according to all service charge data within the predetermined period and sends corresponding incentive funds to the corresponding sellers as per the seller payment proportion according to the total incentive fund. By the aid of the network transaction system, signing of electronic protocols of the transaction platform sub-system and the seller client terminal is also realized. The system can further improve the safety of the transactions and reduce the instantaneous data processing load of a server and the total data processing quantity.