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The serrated flow behavior of Zr61.7Al8Ni13Cu17Sn0.3 bulk metallic glass with different aspect ratios was investigated. For the samples with aspect ratios below 2.0, the serrated flow behavior changes from uniform to nonuniform with increasing aspect ratios. The histograms of normalized stress drop magnitude all exhibit a peak shape and the mean stress drop magnitude increases with increasing aspect ratios. The serrated flow behavior is special and can be divided into two stages for the sample with aspect ratio of 2.5. At the first stage, the serrations exhibit a nonuniform behavior and the histogram of normalized stress drop magnitude exhibit a peak shape. At the second stage, the serration size increases significantly and the histogram of normalized stress drop magnitude exhibits a sporadic behavior. The reason for the appearance of the complex serrated flow behavior may probably be attributed to the complex interaction of multiple shear bands formed during the deformation. [ABSTRACT FROM AUTHOR]