In this paper,the relationship between caking index (G) and Gieseler fluidity of coking coal were analyzed respectively.The change rules of caking index (G) and Gieseler fluidity characteristic of the coal types are mixed.The results indicate that the caking index and Gieseler fluidity characteristic of the same kind of coal show a good additivity,but the additivity of different coal types is poor.With the increase of blending proportion of low Gieseler fluidity coal,the softening temperature of blended coal samples will increase rapidly,and the soft solid interval will narrow continuously.The relationship between caking index (G) and lgMF of blended coal samples can be regarded as the addition of linear relationship and quadratic curve relationship.