It’s very important for storing cotton. Many countries have been exploring the Technology of temperature control in cotton store. This system has adopted new PN sensor to examine the temperature of cotton. This idea is very practical, safety and comes at a low case. This system adopted concentrated structure. The temperature sensor has been distributed every pint of cotton warehouse. With communicating by cable, hardware interface and administer software, it has achieved remote watch system, it’s convenient to store and administer cotton. Furthermore this system owned the function of temperature data storing and point data table.