The invention discloses a method and a device for representing text character generating speed by lines in different colors and lengths. The device comprises a text recording module, a storage system and a text representing module. The method includes the steps: when a string is generated, monitoring the position of a pointer so as to acquire a time interval T for pointer change and variable quantity Char of the generated string; giving more than two time intervals and line colors and line lengths corresponding to the time intervals; judging the line colors and the line lengths corresponding to the generated string according to the monitored time intervals T of the pointer changes and the variable quantities Char of the generated strings; attaching the judged results to the position nearby the corresponding strings; and representing the text character generating speed. The method and the device can be applied to writing correction and the like. A corrector can not only read a final text, but also can know thinking process of a writer. The method and the device for representing the text character generating speed by the lines in different colors and lengths have remarkable effect on writing training and guidance.