This article concerns an integrated control system for grain dryer along with its hardware and software, which concentrates on innovating the shortcoming of the existing control system of homemade dryer. The design is based on the Single Chip Microcomputer(SCM) and Complex Programmable Logic Device(CPLD) so that it enables to effectively control factors, such as temperature and humidity, and enhances the drying efficiency. Relevant data can be measured by applying a variety of temperature sensors, moisture sensors, and position sensors for the intelligent control of dryer. The system can fulfill the setup of the temperature sensors, the calibration and modification of the moisture sensors, and the setup of dryer fifteen running parameters. Furthermore, it can automatically test and give alarm not only for both the humidity, temperature of grains and the failures of the system, but also for the automated control of combustion machine. Besides, the device can realize the real time transmission of moisture volume to the computer so that it is possible to conduct the centralized-monitoring and the statistical analysis of multi-dryers. Being utilized in practice, the system, which is proved to be reliable, promotes various intelligent control properties for dryer operations in high efficiency, and performs many drying tasks with considerable grain drying quality.