The Trojans have become a hidden threat to computer security, how to identify various Trojan efficiently and accurately is a current research focus. In this paper, based on the research of SPID's attribute meters, we proposed a method to detect and identify Trojan that based on the SPID feature optimization. The method uses SPID attribute meters to analysis with common protocol, generating a model to identify Trojan. Then, get the combination of 12 attribute meters to identify Trojan by

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... cal the result of the recognition. Experimental results shows that the optimized combination of attribute meters have a high efficiency to identify Trojan based on keeping SPID detection accuracy.