The article mentions the application direction of the OPC UA Server, real-time messaging API, virtual physical model to build a SCADA 4.0 network, different from the early SCADA systems. The new SCADA system has an intuitive interface design, bringing the physical model into the system to fully simulate the physical properties, the alerts are transmitted directly to the user's social network account, not simply via the alarm. SMS or local. Therefore, we can simulate almost realistically the operation of the device or object to be controlled. This makes it simple and easy for the authors to run the water level control model in the wastewater plant, rather than directly implementing the plant from the beginning, which helps reduce cost, time to deploy and control the system more securely.