[en] Objective: To evaluate the relation between shunt index (SI) and caliber of stent using via rectum ^99mTcO₄^- portal vein scintigraphy and to observe the influence of TIPSS on hepatic hemodynamics. Methods: Nineteen health hybrid dogs were selected to make the model of portal hypertension. ^99mTcO₄^- was infused via rectum before and after Tips and SI and RI of heart and liver were measured. Relation of SI and the caliber of stent was calculated by dispose of statistics. Results: SI positively correlated with caliber of stent; the regression equation was: Y = 0.301 + 0.221X, and correlation coefficient was 0.985, P < 0.05 after t-test. RI ratio of heart/liver (H/L) increased when shunt tract became shut or narrow after TIPSS operation. Conclusion: Stent of 10 mm diameter was chosen on condition that SI was above 40%. When SI was between 30%-40%, the 8 mm diameter stent would be chosen. SI was under 30%, 6 mm diameter stent would be chosen, ^99mTcO₄^- portal vein scintigraphy may check close or open of the shunt tract after TIPSS