Chaos Theory is so complicated and abstract that most of the studies for it are simulate. Thereby, in this passage, a compound pendulum system driven by periodic external forces is built. The data are collected by the contactless Angle sensor and transmitted to the computer in real time after being transformed by AD. LabVIEW software is also used for data processing and analysis so as to show chaos phenomenon in a simple and intuitionistic way. By adjusting the parameters of the system, the angular timing sequence diagram, angular velocity timing sequence diagram and phase diagram of the complex pendulum system moving without driving force and with driving force are described. The sensitivity of initial value and the entire process of the changing of the system from period to chaos are discussed in detail, which realizes the quantitative analysis of chaotic phenomena.