The gasifying reaction mechanism and its law under high temperature about coke,anthracite and their mixture with carbon dioxide in laboratory were researched, so as to offer theory reference for smelting of the blast furnace with the blend mix of ore, coke and anthracite Results show that the temperature of beginning reaction and acute reaction of the coke are both promoted, the coke reaction index is dropped; the coke strength after reaction is heightened All of these illustrate that the anthracite has protection function to the gasifying reaction of coke