The output value of educational resource informatization often exists as a form of non-market value and there are few evaluation methods at present. Based on the feature analysis of educational resources informatization as a kind of public product, a general economic model of users' WTP (willingness to pay) is formulated on the combination of alternation between traditional processes in education and educational resources informatization. A brand new non-market value assessment method and its operational procedure are designed. Finally, the application of model and procedure are applied to a case of WTP assessment on e-recourse pools to validate the effectiveness of the method.