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The unconditional security of quantum key distribution (QKD) can be guaranteed by the nature of quantum physics.Compared with the traditional two-dimensional BB84 QKD protocol,high-dimensional quantum key distribution (HD-QKD) can be applied to generate much more secret key.Nonetheless,practical imperfections in realistic systems can be exploited by the third party to eavesdrop the secret key.The practical beam splitter has a correlation with wavelength,where different wavelengths have different coupling ratios.Using this property,we propose a wavelength-dependent attack towards time-bin high-dimensional QKD system.What is more,we demonstrate that this attacking protocol can be applied to arbitrary d-dimensional QKD system,and higher-dimensional QKD system is more vulnerable to this attacking strategy.