Outlier-tolerance is the important part to the safety studies of technology process, and it is also one of the key technologies that can guarantee the operation safety of the dynamic system. Firstly, how to realize the safe and reliable processing of fault and outliers is discussed. This paper analyzes the significant differences that exist in the three kinds fault tolerance research branches which are fault & outlier-tolerant computing in the field of computer science, the theory and technology of fault-tolerant control system for failure and fault & outlier-tolerant algorithm design and implementation for abnormal data. This paper shows the fault & outlier-tolerant several outstanding public issues in the theory and technology. Finally, the consistency and difference of the three types of fault & outlier-tolerant technology is given in this paper.