With the development of scientific technology, the state of scientific research attention. Laboratory research has a pivotal importance, so the stability of the equipment requirements and its strict stability, because the experimental and scientific research needs mainly on the test equipment and laboratory equipment, because these devices are precision instruments, so the cooling Equipment control temperature in the temperature stability, accuracy have a very high standard requirements. Equipment volume is relatively small, refrigeration equipment have also been small refrigeration equipment, experimental and scientific research room in the venue, and voltage, water resources, so the equipment requirements to be done, the volume of small cooling capacity of the requirements. I combined with these requirements to withdraw from the small precision chiller. The unit is characterized by small size, the amount of refrigeration enough, large in the pump head