Abstract: Disclosed is a non-invasive system for testing blood sugar and a method of the same. The system includes a case, a control key unit, an input electrode unit, a signal filter unit, a signal transformation unit, a control processing unit, a signal amplification unit, an output electrode unit, a driver, a display unit, and a battery unit for preliminarily testing and instantly showing blood sugar or glucose in a non-invasive manner. Owing to a simple structure without any additional device or connection wire, the system is easy to use and practical to assist the user to readily test blood sugar. As a result, the present invention effectively avoids any potential risk of infection of bacteria or other microorganism due to frequently sampling the blood by pricking the finger, and particularly provides a function of fast and readily testing blood sugar everywhere for long term monitoring.