The light microscope and transmission electron microscope were used to obseve hemocytes of A. woodiana. The results shows that the total hemocyte content of A. woodiana was about (2.42±0.38)×106/mL from 6 to 12 centimeters in shell length. Two types of hemocytes were recognized: granular hemocytes and agranular hemocytes,based on either presence or absence of granules in the cytoplasm. Granular hemocytes are distinguished from other hemocytes by a positive feature, the possession of numerous cytoplasmic granules, while agranular hemocytes have few or a few electron-dense cytoplasm granules. In addition, according to the diameter of granular hemocytes and granular size, granular hemocytes were further divided into two categories: large granular hemocytes and small granular hemocytes, about 4.28% and 59.28% in the hemocyte population, respectively. In accordance with the diameter of agranular hemocytes or N/C ratios, agranular hemocytes were further classified into two categories: hyalinocytes and lymphoid hemocytes, about 27.74% and 8.70% in the hemocyte population, respectively. Four types of hemocytes had different tinctorial properties for Wright’s staining in smear. Large granular hemocytes were acidophils. Both small granular hemocytes and hyalinocytes had two tinctorial properties, acidophils and basophils. Lymphoid hemocytes were only basophils.