Ultrasonic testing technology for transformer partial discharge as an effective insulation diagnosis technology,has been widely used in UHV substation.By reference to intensive care technology,the transformer intensive monitoring system based on ultrasonic method is developed and applied in the transformer equipment with hidden trouble or emergency shutdown.Based on the characteristic data of partial discharge ultrasonic signal,this system combines real-time data of on-line or off-line characteristic data,such as DGA and SCADA operation load.Data fusion method is adopted to detect and locate the partial discharge source in real time.The field application shows that the system can detect the internal discharge fault of the transformer,providing effective support for the diagnosis and maintenance strategy of transformers.