Method and system for reminding reader of fatigue in reading while using electronic device

The method and system for reminding readers of fatigue in reading while using electronic devices are revealed. First use a reading speed calculation module to detect user's reading speed within a period of time when the user is using an electronic with a display to read. The reading speed is related to pages being turned or the amount of words being read. Then a fatigue-in-reading reminder module is activated by the reading speed calculation module when the user's reading speed falls within a specific range so as to remind the user by pop-up windows, sounds, flash light or vibration at the proper time and provide the user certain corresponding measures he/she should take. Thereby there is no need to use additional equipment for preventing users from becoming more fatigue and healthy vision is accomplished at lower cost with higher efficiency.