Normal blood test results do not mean that benzene poisoning is not present, and in early acute benzene poisoning, the blood test may show no abnormality. Benzene poisoning cannot be diagnosed solely from the blood test. Symptoms of acute benzene poisoning include impaired consciousness, photophobia, tearing, blurred vision, cough, chest tightness and other mucous membrane irritation symptoms, but the early blood routine performance can be no abnormality, and the diagnosis of acute benzene poisoning should be based on the history of exposure to large quantities of high concentrations of benzene vapors within a short period of time. Chronic benzene poisoning to hematopoietic system damage as the main manifestation, blood routine results can be manifested as a decrease in the number of white blood cells, platelet reduction, severe cases can appear tricolor reduction, and the later stage of the development of aplastic anemia or leukemia. Chronic benzene poisoning blood routine can be used as a basis for diagnosis, but the important condition is still to have a history of chronic benzene exposure, as well as the clinical manifestations of benzene poisoning, such as the poisoning of the class of neurological signs and hematopoietic system damage.