At present,the mainstream technology of Trojan horse detection is the characteristic code detection technology,but this technology lags behind extracting characteristic code,it can not detect the new Trojans.In order to detect the new Trojans better,by summing up the Trojan behavioral characteristics in detail,and constructing the library of Trojan behavioral characteristics,the Trojan detection model which based on the behavioral library has been designed.It can judge Trojan making use of fuzzy pattern recognition.Experiments prove that this model can analyze and judge the behavior of suspicious program,identify the Trojan.This detection technolgy has great value in practical application.