A method of online transaction, in which a visual financial IC card receives transaction transferring data from a client, obtains transaction data, receive an online PIN from a user, obtains online PIN ciphertext by encrypting, executes behavior analyzing to obtain a card behavior analyzing result, sets a first transaction result, organizes message according to the transaction data, the online PIN ciphertext, the card behavior analyzing result and the first transaction result, and sends the message to the client; receives an online response package sent by the client, executes completing process to obtain a completing process result, sets a second transaction result, displays a corresponding information, organizes a data package according to the second transaction result and the completing process result, and sends the data package to the client. In this invention, any transaction terminal is avoided to improve security and convenience of the online financial IC card transaction.