The change of periphral blood picture was relalively examined after the lumbal sympathectomy and even operation by no sympathectomy of dogs, and the results obtained were as follows: 1) No shortened the recovery from the decrease of hemoglobine and erythrocyte count. 2) No reduced the decrease of hemoglobin, but reduced clearly decrease of erythrocyte count. 3) Inconstant about leukocyte count. 4) Inconstant about staff neutrophils, but reduced the increase of total neutrophils. The above concludes that the interception of sympathic nerve of dogs promotes the increase of erythrocytes and represses the increase of neutrophils in peripheral blood.