The reaction between rust of oil tank inner wall and dry H2S gas was simulated.The influence of sulfidation temperature and time，air speed and water was investigated.The oxidation tendency of sulfurized products was investigated by changing oxidation temperature. The results show that the sulfurized products have great oxidation tendency. With the increase of sulfidation temperature, sulfidation time and air speed, the oxidation tendency increase．And the existence of water has remarkable influence on the oxidation tendency of sulfurized products.