Abstract: A design scheme of digital pressure transformer with high precision based on CAN bus was introduced. A diffused silicon type pressure chip with good stability is used to design the pressure transformer. Adjusted signals are dealt with by ADuC836 single-chip microcomputer with good performance and pressure values are put out through CAN bus. The pressure transformer has characteristics of high precision, small volume, high integration, high reliability, high intelligence and low cost and functions of on-line calibration and temperature compensation.