For better prediction of coke behavior in blast furnace,a great many of coke varieties were detected and their relevant data analyzed. The results shuow that the coke reactivity and its strength after reaction have negative relativity. The cold strength of coke and its thermal property was compared. It is suggested that coking enterprise should pay more attention on the thermal property of coke on condition that the coke strength is qualified. According to determination of reactivity and post-reaction strength of cok , the Influence factors H₂O content, method of coke quenching, and material’s struture to the properties of Hard Cok is studied in this paper. The result showed that, H₂O content of coke maintaining low level can inprove the Metallurgical properties; Dry quenching of coke can noteblely improve the property; Material’s struture and property can ultimately influence the property of coke.