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According to the exact expression of the maladjustment, an equation for calculating the boundary of step-size in MLMS algo-rithm is derived and the relationship between the convergence rate and step-size is discussed in detail. It is shown that the threshold ofthe step-size is constrained by maladjustment. Three different properties are presented between the LMS and MLMS algorithms basedon comparison. It is indicated that MLMS does not differ significantly from LMS when the given maladjustment is small.