Serglycin is an intracellular proteoglycan in hematopoietic cells. It has been studied in normal and tumor hematopoietic cell, so it was suggested to have an important role in immunity and cancers as leukemia. The challenge to make a diagnosis for acute leukemia and to differentiate between myeloid or lymphoblastic leukemia, is the reason we go to assay concentration of serglyc in normal people and patient with acute myeloid leukemia and acute lymphoblastic leukemia from children and adult at hematology department in the main hospitals in Damascus ( Pediatric’shopital, Almouasat and Al asaad hospital) before beginning any kind of treatment and studying the relation with white blood cells count. We found clear difference between the concentration in patient with acute leukemia and normal people. There was a high level of this marker in paint with AML in contrast with ALL patients. We found a relation between concentration of serglycin and the count of white blood cells.