Euler’s differential equation is explained by two kinds of solving methods in texts mainly used in the technical colleges. In the present paper, we call the solving method to set y = x Solving Method I and call the solving method to set x = et Solving Method II. Showing some examples, we discuss the difficulties in teaching students how to use the solving methods and try to provide several improvement plans to them with a questionnaire for students. We also refer the format in which Euler’s differential equation is presented in the transfer problem.