The design is based on SEP4020 as the control chip, theμC/OS-II for real-time operating system to manage the various tasks, moved to theμC/GUI to complete the TFT color LCD screen operation, joined the FAT32 file systems on the SD card data storage function operation, using TLC2543 as a data acquisition module of the multichannel portable engine testing device. Realization of real-time data acquisition, data display and storage function. The design has the advantages of simple structure, easy implementation, convenient operation, high efficiency, strong real-time, mobile and universal property.