The nature and perfection of man in view point of Roger and its critique based on Sinaitic philosophy is the subject of this paper. The school of Humanism is one of the most important schools of psychology of the twentieth century, which has serious criticisms of other schools of psychology, especially Psychoanalysis and Behaviorism. The reason for the tendency towards humanistic psychology was a situation in which psychology had been condemned for years and, by limiting itself to the study of behavior, had neglected man himself and instead focused on secondary factors. Rogers is one of the most influential psychologists in the school. As the inventor of the "person-centered treatment" method, he played a major role in advancing this school. The turning point of Rogers’s psychology can is positive attention to human beings. But while Rogers' views are progressive compared to those of previous psychologists, they do have significant drawbacks. In this paper, the principles of human nature and human perfection in Rogers psychology are analyzed and critiqued using Avecinna’s philosophy.