OPC UA - OPC Unified Architecture is the new standard that has developed from OPC standard since 2006. It has solved OPC UA weaknesses based on DCOM of Microsoft. The crucial goal of OPC UA is how to connect completely hardware devices without depending on different manufacture platforms or technologies. This standard will reduce developing and deploying time and cost. The main content of this article is researching more about OPC UA standard .and how to put it into industrial software system, proving its importance. The whole program is defined as Client-server system. Server will connect to devices and OPC UA will manage all the information of each device. From client situations, the authors can monitor information that is provided by OPC UA. Manager can monitor totally device data, information and make decisions to change the value or information of current devices.