Objective To explore the clinical value of related indicators of blood analysis in the differential diagnosis of acute and chronic leukemia. Methods From January 2015 to June 2017, 15 patients with acute leukemia (A group) and 10 patients with chronic leukemia (B group), and 20 healthy volunteers(C group), 20 cases of nosocomial infection(D group) in Jiaocheng People's Hospital of Lyuliang were selected.The differences of WBC, RBC, PLT, HB in four groups were analyzed, and the differences of WBC, immature granulocyte percentage(IG%), immature granulocyte(IG), the percentage of naive cells, immature cells count between A group and B group were further analyzed. Results The count of WBC from high to low was B group [(120.3±39.2)×109/L], A group[(81.4±29.2)×109/L], D group[(26.3±10.3)×109/L], C group [(5.4±1.9)×109/L], there was statistically significant difference among the four groups(P B group [(1.4±0.7)×109/L] > A group [(0.6±0.1)×109/L](P C group [(264.3±84.2)×109/L] > B group [(12.3±6.5)×109/L] ≈A group [(5.9±1.7)×109/L](P<0.05). Through the analysis of bone marrow AML 11 cases, 54.55% was M2, followed by M1, M3, M5.ALL in 4 cases, CML in 10 cases.The IG%, IG count, WBC, percentage of naive cells, immature cells count in A group and B group were increased, but in the different types of leukemia increased in amplitude had significant difference, AML was characterized by the increase of IG% and percentage of naive cells, ALL was characterized by the significant increase of WBC, CML was characterized by the significant increase of WBC, IG%, IG count. Conclusion Blood analysis is of high value in the differential diagnosis of acute and chronic leukemia.It can provide a reliable basis for the initial diagnosis and classification of leukemia, and can be used to guide clinical treatment. Key words: Leukaemia; Blood chemical analysis; Leukocyte; Immature granulocyte; Immature cell