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In passive millimeter wave detection system, it is easy to be passive jamming (such as planar metal, ground water, etc.) mistakenly identified as an armored target, when the signal amplitude value was deemed as a decisive characteristic. In order to solve this problem, this paper proposes a new feature named as entropy. According to the antenna temperature’s composition of typical targets, proposed the extraction method of signal entropy feature. Analyzed a large number of detection signal entropy features, the results showed that the entropy feature of armored target significantly different with planer metal and ground water. The results of this paper provide a new analytical thinking and theoretical guidance for the armored target identification.