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The system generally by a group of online ups related individuals, according to pre-programmed good rules to work, to complete the individual components can accomplish the work groups. The system is divided into natural system and human system two categories.

A group of interconnected individual component is called system.

Chinese scholar Tsien Hsueshen thinks: the system is determined by the interaction of mutual dependence of several components of combined, have specific functions of an organic whole, and the organic whole and its subordinate greater system components.

In English system ( system ) is derived from the ancient Greek ( syst εm α) as part of the overall composition. System definition should include all system properties shared by all. General system theory founder Bertalanffy definition: "the system is interacting elements complex ". This definition emphasizes the interaction among elements and system element integration. It can be expressed as: Definition 1 if the object set S meet the following two conditions

( 1) S contains at least UPS system two different elements

( 2) the elements of S interconnected according to a certain way

S is called a system, S elements to the system components.

This definition indicates that the system with three characteristics: a plurality, system is the unity in diversity, the unity of diversity. The two correlation, system do not exist in isolation elements, all elements or components of interdependent, interaction,no break mutual restrict. Three overall, system is all elements of the compound unity. This definition illustrates the general system characteristics, system and non system to distinguish, but for the definition of complex system has limitations. In addition the strict sense of the real world " system " does not exist, integral and no ties of the multiple sets is not exist. For some groups of elements between weak, thus can ignore this link, we regard it as the two kind of system.