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The fusion hindrance in heavy ion collisions is studied in the framework ofthe two-center liquid drop model. It appears that the neck and the radialdegrees of freedom might both be hampered by an inner potential barrier ontheir path between the contact configuration to the compound nucleus. Heavy ionreactions with and without the two kinds of fusion hindrance are classifiedthrough systematic calculations. It is found that the number of reactionswithout radial fusion hindrance is much smaller than that without neck fusionhindrance, and for both kinds of fusion hindrance the number of reactionswithout fusion hindrance at small mass-asymmetry parameter $\alpha$ is smallerthan that at large $\alpha$. In the formation of a given compound nucleus, if areaction with $\alpha_c$ is not hindered, then other reactions with $\alpha >\alpha_c$ are also not hindered as it is well known experimentally.

Fusion Hindrance in the Heavy Ion Reactions -- Border Between the Normal and Hindered Fusions