Abstract: The influences of temperature and alkali metals on the gasification reactions of 5 kinds of stamp charging cokes were investigated by simulating the real conditions of blast furnaces. The carbon solution loss reaction regularity of the cokes was also analyzed by testing the optical textures and microscopic pore structures. The results show that the mass loss ratio of the cokes can increase quickly by rising the reaction temperature or enriching alkalis. Without alkalis,the mass loss ratio of the cokes increases slowly firstly and then quickly,and it is low when below 1000℃; but with alkalis,the mass loss ratio of 4 kinds of stamp charging cokes increases quickly firstly and gently then,and it reaches the maximum at 1100℃. The cokes contain more closed pores,more small pores,less large pores,and a few cecum-like pores locally. The quantity of large pores and connected pores in the cokes increases after the reactions. Except stamp charging coke A,whose coke reactivity index is the lowest,the other 4 kinds of stamp charging cokes are mainly basic anisotropic and coarse mosaic structures,which are less resistant to alkali metals at 1000℃ and 1100℃.