Abstract: The subjects in this experiment were 72 middle school students.The method used combined natural experiment with scale-measures and questionnaire evaluation to study the decision process of the way to help others.The result of the experiment showed that most of the students used customary decision model which could apparently enhance their ability of decision to help others and probability of prosicial behavior to change their decision model into a scientific one.This technique has much value to adolesent moral education.

Key words: decision, customary decision model, scientific decision model