This paper discusses the number of scholars and their scientific interests in the reign of Bu-veyhid. Buveyhid the most important Iranian-Shi ‘it dynasties appeared in the early era of Islam. They were so powerful that the Abbasid Caliphs had to obey them. According to their Shi ‘it religion, they practiced the idea of democracy and all sects were free in their reign. According to the survey more than 350 scholars were prominent in this period, during 320/900- 450/1050. If we count their specialty, the number increases to about 714. What is in-teresting is that we can find all fields specialists at that time. They are from all religions and also Islamic sects. The number of Shi ‘it scholars is outstanding among them.
