Hydroquinone always exists in the environment by dust. For rapidly detecting it in the atmosphere, the off-line laser mass spectrometry is used to analyze the LDI mass spectra of hydroquinone firstly. And we find 110M+ is the characteristic spectrum. Then we acquire the LDI spectra of hydroquinone aerosol by aerosol time-of-flight laser mass spectrometry. Besides, no influence of impurity NaCl to the detection of hydroquinone is found, which is useful.