Soft errors

caused by the radiation of cosmic rays

are one of the top challenges for space computing.With the continuously progress of integrated circuits

the dependability of modern processors is increasingly affected by soft errors.Currently

few works analyze the impact of soft errors from the perspective of software.This paper presents a quantitative approach

named PRASE

which is able to analyze the effect of soft errors to the reliability of a given program.Moreover

the analytical performance is increased significantly with the help of the basic block analysis and three arithmetic laws.The experiments show that the reliability of a program has a connection with its native structure.Furthermore

the analytical results also identify the vulnerabilities of a given program under the occurrence of soft errors.These contributions are in favor of implementing the high efficient algorithms for tolerating soft errors.