Structural seismic design is a professional course for the undergraduate students in the college of civil engineering. As for the strong professional background, its content is widely involved with the non-instinctive content. In order to deepen the knowledge of this course and train the ability of practice for the student,the dynamic analysis demonstration software is written by MATLAB GUI. Focusing on the key issues as earthquake action, response spectrum and dynamic response analysis, improving teaching effect is discussed for better learning and practice of students.