There is a serious crossing-term problem when Wigner-Ville distribution(WVD) is used to analyze multi-component non-stationary signals. While，using Gabor-Wigner transform(GWT) can avoid the crossing-term problem and maintain the clarity as good as WVD. But as the component frequency of multi-component signals interfere each other，GWT can’t get clear-cut results. A modified STFT-Wigner is proposed to suppress the cross terms in WVD effectively and maintain the clarity. This method is proved to be practical through analyzing simulation signals and experiment signals.