Lissajous graphic demonstration device is introduced. The reason why Lissajous figures is formed

through theoretically analy- zing the thin film ' s forced vibration. The experimental

results show that the shape and size of Lissajous figures change periodically when the

frequency of the sound source increases. Finally，the effective surface tension value is estimated

to be about 46.00 N / m through the measured resonance frequency when the surface area of latex

ballon is twice the normal area，indicating that the device has certain practical applicability.