Abstract: To combine RISC framework ARM chip, embedded LINUX operating system and information pretreatment technology, this article establishes equipment fault diagnosis information pre-treatment system.It processes the overall scheme and the software of system design, and designs a digital filter toolkit. The simulation experiments show that this system can filter out the interference and noise in the signal quickly reliable and accurately, and improves the purity of information, lays out a good foundation for future information processing and fault diagnosis.