The invention provides a self-adaption and self-coordination unified communication system based on SDN, including distributed performance monitors, a communication module and a unified communication coordinator. The distributed performance monitors are used to monitor the communication states of service applications at the application layer, and feed back the states to the unified communication coordinator; the communication module is used to respond to the application requests from various business systems, receive the feedback on the communication states from the coordinator, and feedback abnormal and emergent events upwards; the unified communication coordinator is used to collect the communication states of all the application reported by the distributed performance monitors and health conditions of the communication devices reported by the SDN controllers from the network layer, and based on the requirement of the applications, updates the control strategies, and then, through the SDN controllers, makes the entire SDN network implement the strategies. The system and the method use the performance monitors and the unified communication coordinator to coincidentally monitor the operation conditions of the communication situation of the application layer and network layer; and through the SDN programmable control, it is possible to both meet the individual needs and meet the communication capability and network optimization of a macro entire internal network.