Three-types of expandable metallic stents were constructed to evaluate the differences between the stents:one, formed in a cylindrical zigzag with stainless steel wire (Gianturco stent). another, made by coating the Gianturco stent with silicone rubber (Silicone stent), the third, made by coating the Gianturco stent with 24 carat gold (Gold stent) for tissuse acceptance. A total of 69 stents (each 23 stents of Gianturco, Silicone, and Gold stents) of 8-12mm in diameter and 20mm long were placed into normal abdominal aorta, inferior vena cava and iliac artery of nine adult dogs for 2 weeks to 11 months. It was more difficult to intrcuce Silicone stent into an introducing sheath than Gianturco or Gold stent due to the thickness of silicone rubber. Four Gianturco stents and three Silicone stents showed migration but Gold stent did not. Luminal narrowing or occlusion was noted in 3 Silicone stents, in 2 Gianturco stents, and in 1 Gold stent. Neointimal proliferation over the stent wires was more rapid and even in Gold stent than Silicone or Gianturco stent. Although further study is needed, Gold stent seems to be better than Guanturco or Silicone stent as an endovascular graft material.