Cognitive Diagnosis(CD),Automated Item Generation(AIG) and Computerized Adaptive Test(CAT) are the developing region in modern psychology measurement.

Computerized automatic item generation has been gradually recognized as one of the promising techniques to deal with test exposure in recent years.

With the development of cognitive psychology theory,psychometrics and computer technology,item generation technology,which is based on cognitive theory,had become mature gradually.

Constraint conditions and countermeasures for overseas automation projects;

Our experimentation proveed that: the compress image had a good effect by view,with no fuzz and strip phenomenon: The result was more satisfactory by extracting endmembers from exemplar using the algorithm namely automatic target generation process than usin.