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In order to control the complex field of physical experiment by instrument, the requirement of controlling by Virtual Instrument (VI) and the characteristics of the experiment are discussed at first. With the help of VI technology, a synthetic experimental controlling system is built, which includes several advanced functions, such as remote batch setting of the status of oscilloscopes, automatic collection of scope waveforms. Meanwhile, the system can also be used for the concurrence control of voltage-enhancing and voltage-reducing of high-voltage power supply, and the time correlation control of the instrument. For the experiment field monitoring, the power of UPS and pictures or videos of the field can be obtained through this system. The key techniques and the core thoughts are given in the article and the core code of a certain type of oscilloscope are listed. The result shows that the system accomplishes the goal of controlling the status of various instruments by a general control (operated by one person) or by decentralized control (operated by several people), and this system can be further used for controlling different types of oscilloscope in the same way.