In high school physics, simple harmonic motion is the most basic vibration, but experiments that can demonstrate the vibration curve of simple harmonic motion have many inconveniences in operation. In response to the shortcomings of traditional simple harmonic vibration image demonstration instruments, this instrument uses a laser pen and optical variable materials to create a new type of traceable teaching instrument, which can simply and intuitively depict the vibration curve of a single pendulum and a spring oscillator during motion, And it can be proven through data processing that it is a sine curve. In addition, the instrument can also demonstrate the vibration curve of damping motion, and has strong exploitability for depicting the trajectory of curve motion. The instrument is designed simply, easy to operate, reusable, and has good experimental results, which can greatly improve the teaching efficiency of teachers