A high sensitivity cesium atomic magnetometer with wide temperature characteristics is developed to meet the magnetic anomaly detection application requirements on an airborne platform. The problems of existing sensors such as small operating temperature range and easy magnetic field lock-out at low temperature. The temperature feedback mechanism is utilized to compensate the excitation source of the cesium atomic lamp in real time, and the atomic magnetic sensor′s stability and working temperature range is improved. The stability of the output optical power of cesium atomic lamp is increased from 2. 10 ( standard deviation) to 0. 62, and the operating temperature range of the sensor is increased from - 20℃ ~ 60℃ to - 50℃ ~ 70℃ . The design and parameter optimization of cesium atomic magnetic sensor are presented, which are based on low-noise cesium atomic lamp and a cesium vapor cell with a narrow bandwidth. A prototype of high sensitivity cesium atomic magnetometer is developed. Test results show that the cesium atomic magnetometer prototype′s measured sensitivity in the geomagnetic background is around 140 fT/ Hz@ 1 Hz, which is better than that of comparable worldwide commercial items (Geometrics G-824A cesium atomic magnetometer).