Abstract: The effects of solvents such as water, methanol, ethanol, 1-propanol, 2-propanol and 1-butanol on the crystal habit of hydroquinone were studied.Growth experiments of hydroquinone single crystals were performed in a jacket crystallizer by cooling crystallization.Scanning electron microscopy, differential scanning calorimetry, powder X-ray diffractometry and single crystal X-ray diffractometry were used to characterize the produced crystals.The experimental results showed that the crystal habit of hydroquinone was evidently influenced by the property of solvents.The length-diameter ratio of the hydroquinone crystal decreased with the dielectric constant of solvent.Based on the theoretic prediction by Cerius² software, the mechanism of the effect of solvent on the crystal habit of hydroquinone was analyzed.