The bacterial incubator has certain requirements in terms of a temperature setting, it is used in the semiconductor refrigeration piece, semiconductor refrigeration piece of a single refrigeration component for power is small, but the combination into the electric pile, with the same type of pile method combined into refrigeration system in series, in parallel, power can do a lot, so the refrigeration power can do a few milliwatts to tens of thousands of megawatts range. It can fully meet the work requirements of the bacterial incubator.