The status of a certain type of aircraft servo solenoid valve determined the response performance of the control system. In the traditional solenoid valve fault detection process, solenoid valve whose features was not strictly in a healthy state nor in the fault state, its fault diagnosis mainly depended on the experience of testers, which was low efficient and subjective. Fault detection method was proposed. First, the collected data were processed according to fuzzy rules, then the electromagnetic valve state index of the representation condition was obtained through fuzzy settlement, and the fault detection of the solenoid valve was realized. The experimental results showed that the proposed method could improve the accuracy of the aircraft fault detection.