Beta-thalassemia, by its high frequency and heterogeneity, constitutes a real problem of health in Iran . About 13 beta globin mutations encompass 70-90% of mutations spectrum in Iran , the rest are rare or unknown. In this study six mutations of the codon IVSI-130(G-C), Frl6 (-C), codon35 (-C), fr23/24(-G), codon8 (+G) and codon 20 (GTG-GAG) were recognized and added to spectrum of beta globin mutations in Iran , using ARMS/PCR and DNA sequencing. Three latter cases are reported for first time.