Abstract：It is necessary to create a new precursory observation devices lab to meet the needs of training and teaching,but it is very expensive and there is requirament of high quality to the lab environment. Computer technology can simulate the real devices. According “Stipulation on Net Communication for Devices in China Geophysical and Geochemical Observatory Network”, Communication primitives and data package format are introduced. With the objectoriented principles, socket and multithreading technologies, a simulation system is designed in Java, which can simulate all communication primitives. The subsystem design and design models of the system, which can help trainees and students to learn the device features, communication primitives and data format, are introduced as well.
