Abstract: Stamping process of automobile body parts production is being steered towards high speed, high efficiency, digitalization and intelligent control. At the same time, the maintenance of large high speed press line encounters several difficulties such as complicated structure, multiple fault points and shortage of human resources. Press maintenance begin turning to predictable maintenance from traditional repair after troubleshooting and preventive maintenance. This thesis proposes JIER-intelligent maintenance systems (J_IMS) for status monitoring and intelligent maintenance of large high speed press line. Firstly, digital twin model for real press line is created via 3D software. Users can access in real-time the running data of high speed press line via common structure OPC UA. Physical press line and twin press line are connected by data link. Digital twin model of press line is driven with assistance of unity data drive. Thus synchronous motion between physical press line and its twin press line is achieved. Numerous projects applications have verified validity and accuracy of J-IMS, offering good reference for intelligent maintenance and status monitoring of large speedy press lines.