One or more temperature sensors are installed in an ordinary shirt to insure that the temperature can be measured accurate without bias. Ming Yang Biomedical has developed novel packaging technology such that the temperature sensor as well as the whole shirt is washable, and it is also comfortable as ordinary shirt does. Thus, the Body temperature sensor can give continuous monitoring without interrupt or annoying the wearer for 24 hours. A detachable control box is connected to the temperature sensor and transmits body temperature to a cell phone or a computer that shows and analyzes the body temperature. An accelerometer and a temperature sensor installed in the control box helps to screen out interference caused by body movement and give more intelligent analysis.