Abstract: Specific emitter identification(SEI) is a hot point in the field of electronic war.The use of emitter’s intrapulse is a nature choice in SEI.A robust hypothesis testing method is proposed for the SEI application in the multi-channel environment.The algorithm uses the local correlation between multi-channel signals and direct signals in frequency domain,constructs a ε-contaminated model which models the multi-channel disturb as a signal-dependent noise.The derived detector is a correlation-limiter in frequency domain.The simulation proves its performance,and indicates its mechanics of frequency selection.