A remote voice detection system is designed. Laser output light is focused on the surface of the forced vibrated glass nearby the sound source, and the reflected light, carrying the information of the sound source, is converted to electrical signals by the photodiode. The signal is amplified and sent directly to a speaker to obtain the remote voice detection. A computer sound card which is the essential part of the apparatus because it processes signals from the photodiode is designed. Signals analysis system is also designed based on LabVIEW software. Testing results show that the system can detect the voice signal from an analog room in a distance of 50.7 m with high sensitivity. This design is simple operation, low manufacture cost.