The invention discloses a Chinese character input method, device and system and belongs to the technical field of computer input methods. The method includes that a candidate word list is obtained according to codes input by users, and the candidate word list comprises at least one candidate word; at least one candidate word is selected from the candidate word list, a synonym service request is sent to a synonym server and includes the selected candidate word; and a synonym matched with the selected candidate word and returned by the synonym server is received, and the candidate word list and the synonym are output. A client comprises a selecting module, a sending module, a receiving module and an output module. The synonym server comprises a receiving module, a seeking module and a sending module. The system comprises the client and the synonym server. By means of the Chinese character input method, device and system, the candidate words and the synonym can be output, the users can have more output result choices, and an output result truly desired by the users is obtained.