The correlationbased leak location errors are large due to the multimodal and dispersive characteristics of leakageinduced acoustic emission. One kind of leak location in the gas pipelines by extracting the single nondispersive mode is proposed in this study. The crosspower spectrum of the single modal and nondispersive component in the leak acoustic emission can be obtained by applying the weighing window with parameters of the wave number of the relative mode. Then, the crosspower spectrum of a single modal and nondispersive component is analyzed by the inverse Fouriertransformed to acquire the crosscorrelation for estimating the time delay. Hence, the acoustic velocity of a single modal and nondispersive component can be used for calculating the leak position more accurately. The experiments of leak location indicate that the relative error is reduced at least 7%. The reason is the enhancement of correlativity of a single modal and nondispersive component in leak acoustic emission and the adoption of a more accurate acoustic velocity. It shows that the timedelay estimation by extracting the singlemodal and nondispersive component in the crosspower spectrum of leakageinduced acoustic emission signals will enhance the leak detection and location.