方法：分析样品中菌落总数不确定度的来源，采用合并样本标准差的方法来评定菌落总数的不确定度。
Methods: the source of measurement uncertainty of the colony determination in fishmeal was analyzed and the method of uniting standard deviation was applied to determine the uncertainty of the colony.
通过对标准样品的多次测定，测定值均在其保证值范围内，相对标准差为0 7%，准确度高，精密度好。
Test result in many times indicated that the detection value was all in the control limit. The relative standard deviation was 0 . 7% with high accuracy .
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