Abstract: In view of the current power supply situation of on-line monitoring system for tailings dam，such as harsh environment，frequently power outages and other problems，a new intelligent technique an device of power supply was developed，which were reliable and suitable to harsh environment.When the system suddenly meets power loss，it will be switched to intelligent device seamlessly.The on-line monitoring system for tailings dam also contains the wind and solar power generation system，to ensure that the monitoring system is not cut off and data is not lost.The test result shows that intelligent device of power supply is reliable for stable operation of the tailings dam on-line monitoring system.

Key words: Tailings dam, Power supply, Intelligent, Network management