40 wild Euchiloglanis davidi were studied on the plasmic biochemistry indicators, classification of blood cells and haecytogenesis. In the plasmic biochemistry indicators， there were (48.35±3.60) g/L total protein, (8.73±0.54) g/L albumin, (39.63±3.10) g/L globubin, (5.05±2.14) mmol/L triglyceride, (16.66±3.64) mmol/L cholesterol, (1.01±0.43) mmol/L very low density lipoprotein (VLDL), (5.27±2.43) mmol/L glucose in plasma. These indexes indicated that albumin, globubin, triglyceride and cholesterol were positively high, but glucose negatively low in plasma of freshwater fish. These characteristics showed that E. davidi has large activity amount and is coldwater fish, which utilizes lipid and protein as main energy resource. In corpuscle of the fish, there were erythrocytes, ghost cells, lymphocytes, thrombocytes, neutrophilic granulocytes and monocytes to be found. By counts with blood smears, there were 96.58％ erythrocytes （therein, 65.92% erythrocyte and 30.66％ erythroblast）and 3.42％leucocytes (therein, 2.37% lymphocytes, 0.85% thrombocytes, 0.14%, neutrophils and 0.07% monocytes). Most original corpuscles were found in pronephros and mesenephros and some original leucocytes were also found in spleen, but no original corpuscles were found in liver and blood. In E. david, pronephros and mesenephros are the principal hematopoietic organs. Erythrocytes mainly come from pronephros and leucocytes mainly come from mesenephros. Some leucocytes are also produced in spleen.