A reliability design method for embedded system serial communication receiving processing is described. The layer concept of ISO model is introduced. A modularization programming architecture is built by defining generalized frame format. Based on this, three cycle truncation methods and a new ring buffer parameters building mode are proposed to enhance the closed-loop reliability of the ring buffer. The unexpected failure occurred in communication is suppressed and the fault-tolerant features are enhanced using timing and logic monitoring method. The software has better adaptability, transplantation and easy to be maintained and tested.