During experimental applications, it is observed that students are unconsciously used the making a drawing diagram strategy while solving other problems. There is a usage difference of the making a drawing-diagram strategy between the beginning and the end of the experimental applications. At the beginning of the application, students frequently chose to use making a drawing-diagram strategy for four-operation problems; however, at the end they did not prefer to use these strategies. This result is consistent with Carpenter and his friends’(1999) finding, which is making a drawing and schema etc. type strategies are abandoned in time.