Abstract: In view of problems of bad stability and anti-interference ability and low precision existed in measuring system of ventilator performance taking single-chip microcomputer as core, a distributed measuring system for ventilator performance was developed which takes PLC as core and uses mutual-inductance collecting module EDA9033A to collect electrical parameters of ventilator. Structure of the distributed measuring system of ventilator performance was gave, and design of hardware and software of EDA9033A was introduced in details. The actual application showed that collecting result of EDA9033A for electrical parameters of ventilator is stable, fast and accurate.