Abstract: By the automatic tracking function of the software Tracker, the damped vibration of spring oscillator has been tracked effectively. The displacement-time curve is depicted in the real time. The vibration equation and envelope equation are fitted by the fitting function of the software. The damping coefficient of air track is calculated. The phase diagram can be obtained by the function of coordinate transformation.

Key words: software Tracker, video analysis, damped vibration, vibration curve, damping coefficient