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This paper analyses the problems that the transaction scheme of existing digital products existed. We propose a relatively perfect transaction scheme. In the scheme, combining digital watermarking and fingerprinting with digital signatures, a relatively less amount of information is embedded in a digital product , so as to reduce phenomena of descending quality, as well as issues of mutual interference, and improve efficiency Before the trade, a robust symmetric watermarking was embedded in a product sample and get a new product. Then the new product is signed. Thus online buyer may verify legitimate copyright and find timely pirated products. During the trade, after an asymmetric digital fingerprinting was embedded in the digital product, could trace pirate by the trade fingerprint, could prevent merchant from bring a false charge against the buyer, and could also have an anonymous property for the buyer.