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Small and medium-sized LED dot matrix display is widely used. In order to show steady large-size images, a LED dot-matrix driven method based on the combination of single chip microcomputer and CPLD is presented. An Intelligent LED display is designed. The hardware and application software of system are designed and the whole principle of various details in the system is described. AT89S52 single-chip microcomputer is used for data control and external connection of system. Altera's CPLD EPM7128 chip is used as the display hardware control circuit to display information dynamically, under the control of the single chip microcomputer. The experimental results show that this control method, compared to traditional single chip microcomputer or a single scan cpld drive, has advantages of high efficiency and good display effect. The system can be fully utilized to control a flexible single-chip, CPLD drive ability, the logic of the advantages of easy modification. Due to the versatility of this design, it can be widely used in any of the occasions the need to display information.