Traditionally, it is very important in delivering the data with secretly and low cost in a distributed environment. Use the reliable method to assist the organization in communicating with each other needs to be discussed. Thus, we propose the Two-Phase Agreement (TPA) protocol to solve those problems by verifying the received messages and achieve the agreement. The TPA protocol will assist the organization in achieving the agreement and generate a common key to verify it. Similarly, there are many faults and attacks in the network, such as interruption, interception, modification and fabrication. The messages from a source might be changed. However, we can use the TPA protocol to remove these influences of faulty. The proposed TPA protocol doesn?t only decrease the complexity of messages but also increase the capability of fault tolerant. Similarly, it is more reliance via the secret key in a real distributed system. This protocol can solve agreement problem in net-meeting between the arbitrary processors, likes the sub-companies communication with the main-company or makes a decision in the company conference.