The temperature detector is used in conjunction with the electrophoresis power supply (BG-power600h) to automatically monitor the electrophoresis temperature from 0° C to 100 ° C. Temperature control is particularly useful for DNA sequencing electrophoresis and single-strand conformation polymorphism (SSCP) analysis, because the constant temperature is an important factor affecting the resolution and repeatability of the experiment. It can be easily used once you connect the electrode to the power supply and the sensor to the glass plate of the DNA sequence analysis electrophoresis system or the thank of the nucleic acid or protein electrophoresis system. The temperature data is transmitted to the power supply. During the electrophoresis process, the power supply adjusts the output power according to the received temperature data to keep the constant temperature.