Objective To study pharmacokinetics of domestic sufentanil as a single intravenous injection in Chinese patients undergoing abdominal surgery. Methods Ten patients undergoing abdominal surgery, ASA Ⅰ-Ⅱ grade,age from 51 to 65 years old,weighing from 58～68 kg were studied. Intravenous and intra-arterial cannulae were placed in advance. After general anesthesia, sufentanil 2 μg/kg was administered as a rapid bolus intravenously. Blood samples were obtained at 1,3,5,10,20,30,60,120,180,240 and 360 min after sufentanil injection. Plasma was separated from blood samples immediately and stored at -80 ℃ until assayed. Plasma concentration of sufentanil were determined by liquid chromatography mass spectrometry, pharmacokinetic parameters were calculated by 3P97 pharmacology program:central volume of distribution(Vc), apparent volume of distribution (Vd), rapid distribution half-life(t1/2 π), slow distribution half-life(t1/2 α), terminal elimination half-life(t1/2 β),speed constant(P, A, B, π, α, β, k10, k12, k21, k13, k31), clearance(CL)and area under curve(AUC)and so on. Results Pharmacokinetics of sufentanil in patients ndergoing gastrectomy was best fitted to three-compartment open model,the tri-exponential equation :Cp(t)= 2. 86e-0.8241t + 0.75e-0.0604t + 0.14e-0.0050t. Main pharmacokinetic parameter t1/2π =(1.29 ± 0.81)min, t1/2α =(12.20 ± 2.84)min, t1/2β =(150.50 ±48.71)min,Vc =(0.552 ±0.104)L/kg,Vd =(9.008 ±0. 754)L/kg,CL =(0.044 ±0. 011)L/(kg · min)and AUC =(47.58 ±11.88)ng/(ml · min). Conclusions Pharmacokinetics of domestic sufentanil in patients undergoing abdominal surgery was best fitted to three-compartment open model, and the pharmacokinetic characteristics of sufentanil were consistent with its clinical pharmacology.