The Ultra Low-temperature Freezer widely used in scientific research is controlled by micro-computer; digital display of temperature; the inner temperature adjustable between -10°Cand -86°C. Adjustable alarm control of high or low temperature. Multi malfunction alarms: high temperature alarm, low temperature alarm, sensor malfunction alarm, open the door alarm, power off alarm and reserve battery with low-energy alarm etc. Optimized cascade refrigeration technology, unique evaporative condensing heat exchange system design, thus stronger refrigerating capacity. Uses imported international well-known compressor. Optional remote alarm, optional temperature recorder, easy to monitor and control.