Photoactive cocrystal materials have received growing research interest in construction of photofunctional systems owing to the crucial roles in modifying the photo-related properties of molecular solids,based on the non-bonding interactions between self-assembly units.Herein,we report tunable luminescence and acid-base stimuli-responsive properties ofa cocrystal assembled by 4-[2-(4-quinolinyl)vinyl]phenol (qv) and tetrafluoroterephthalic acid (a).The luminescent properties (such as wavelength,quantum yield and fluorescence lifetime) of qv.a changed obviously relative to the pristine qv,due to the proton transfer and the alternation of molecular arrangement within two-component crystalline material.The photoemission intensity of qv.a underwent from weak to strong upon HC1 gas fuming,and the corresponding wavelength changed from 517 nm to 597 nm,which can be reversibly transferred after exposed in NH3.Such luminescent switching behavior may provide an effective way to develop new types of photoactive stimuli-responsive materials and optical sensors.