The need to solve complicated problems in the real world is the direct driving force for the quest of flexible logic system, which is the future of current development of logics. The theory of universal logic is a new flexible logic system, developed by He Hua-Can during his exploration of the flexibility of logic. This paper discusses the flexibility of probability logic based on the ideas and methods in the implementation of flexible logic. Theoretically, probability logic is a special example of the universal logics. So it is possible to build flexible probability logic in the framework of universal logics.