The invention discloses a mood information implementation method and system. A method for transmitting mood information comprises the following steps: acquiring information to be transmitted, and acquiring encoding information which corresponds to the current mood of a user from a database; adding the encoding information into a preset position of the information to be transmitted to generate mood information, and transmitting the mood information to a receiving party. According to the mood information transmitting method provided by the invention, the mood of the user is embedded into the information to be transmitted through an encoding way, and ordinary information becomes mood information with the mood state of the user, so that the fullness of information and the ideographical expression accuracy are effectively increased. The invention further provides a mood information displaying method. After the mood information is received, the mood information is displayed through a stored mood information display template, so that the problem of information content ambiguity is solved, and information interpretation error is avoided effectively. By adopting the mood information implementation method, the reliability of information interaction is realized, and better experience can be brought to the user; the mood information implementation method is wide in application prospect.