A new type airborne thermograph is introduced.A platinum membrane Pt100 is used as sensor. The response time of the sensor is less than 0.1 second. The selected circuit element is examined closely. Design performance is excellent.It Works steady, no drift almost. The precision of the measurements is high. The maxmum error is less than 0.1℃ within the range from -20℃ to 40℃ after calibration in the National Center of Meteorological Metrology. In addition, it provides convenience for the operators due to dispose an application software with curve and number display on realtime as well as memory function.