Five electronarcosis groups and one control group were designed to study effects of electronarcosis on haematological biochemistry of juvenile Siberian sturgeon Acipebser baerii.Results showed that total protein and albumin of sturgeon in the electronarcosis groups increased positively with voltage intensity.The values of total protein in the 35 V group were significantly higher than those in the 15 V and 20 V groups.The concentrations of high density lipoprotein cholesterin,low density lipoprotein cholesterin and triglycerides were the lowest in the 35 V group and was the highest in the 15 V group.These three indexes in the 35 V group were significantly higher than those in the control group and the 15 V group.There was significant difference between the 15 V group and the 35 V group.The value of glucose in the control group was 2.21 mmol/L.The values of glucose in each electronarcosis group were higher than those shown in the control group.Urea and total bilirubin were the lowest in the 15 V group and the highest in the 35 V group.The values of alanine aminotransferase,aspartate aminotransferase and lactate dehydrogenase were relatively steady.The value of alkaline phosphatase in the control group was 218.33 U/L.The value of alkaline phosphatase in the 35 V group was significantly higher than that in the control group and the 15 V group.The present study showed that electronarcosis was a good anaesthesia method.The appropriate voltage of electronarcosis in Siberian sturgeon was from 20 to 30 V.