The conventional method of engineering geological analogy is expanded by me-ans of the computer technique. This expansion method is called the engineering ge-ological analogy system. As geologic bodies are very complex and highly varied, amodel for the engineering geological evaluation is proposed. It does not call for sum-marizing common knowledge and its application but applies experience or lessonsin the evaluation of objects of study by means of analogy of the charactsrs of indi-vidual objecte. Its application can avoid the errors caused by other evaluation me-thods owing to oversimplification of the conditions and is conductive to fining outand utilizing useful information hidden in geologic bodies not known yet. Its preli-minary application indicates that it is suitable to many cases and has a rathergood prospect.