The present invention provides a network transaction system for a network transaction platform, comprising a transaction platform sub-system, a service fee sub-system, an incentive fund sub-system and a seller client. The transaction platform sub-system calculates service fee data for transactional capital of each transaction according to a pre-determined service fee ratio, and sends the service fee to the service fee sub-system. The incentive fund sub-system calculates, according to all service fee data in a pre-determined period, a seller payment ratio of the sum of service fee corresponding to all transactions of each seller in the pre-determined period to a total service fee in the pre-determined period, and sends corresponding incentive fund to a corresponding seller based on the seller payment ratio according to the total incentive fund. The network transaction system further realizes an electronic agreement being signed between the transaction platform sub-system and the seller client. The present invention is capable of further improving security in transactions and reducing an instantaneous load in data processing for the server and the total data processing amount.
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