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<正>To consider the starting traction and breaking force of railroad,evaluations of the contact force and the tangential traction are important.The method of caustics,which is a non-contact optical measuring methods,is powerful technique to evaluate such normal and tangential forces.Size and shape of caustic image are considerably changed depending on the loading condition,then the loading condition could be evaluated using the caustic image.To apply this method,preliminary simulations are necessary to obtain the relationship between the loading condition and the size/ shape of the caustic image.Authors have make developed this method to a powerful technique by creating the simulation program using Java as the web-program.In this paper,based on the concept of database,a contact-load evaluation program from caustic images is developed.Using this program,simulation is no longer necessary to evaluate the loading condition.