A single sensing system can only monitor one parameter in distributed fiber sensing and applications.For example,phase sensitive optical time domain reflectometer(Φ-OTDR) can only monitor vibration information along the fiber,and Brillouin optical time domain reflectometer(BOTDR) can only monitor strain/temperature information.Multi-parameter monitoring and analysis must be implemented with multiple technologies and systems in multi-parameter applications,which increase monitoring costs and complexity.A dual-parameter distributed optical fiber sensing system integrating Φ-OTDR and BOTDR was designed and built.The system achieves dual-parameter detection of temperature/strain and vibration in a sensing fiber by simultaneously measuring Rayleigh scattering and Brillouin scattering signals in the fiber.After testing and verification,the measurement distance is more than 50 km,the spatial resolution is up to 20 meters,the temperature measurement accuracy is ±2 ℃,and the frequency measurement accuracy is above ±0.15 Hz.