Reasearch on the history and perspective of system of systems

The definition, characteristics, classifications, development are summarized first in this paper. Then, compare system with system of systems (SOS) is followed with the problems during the development of SOS. From what is discussed above, the basic knowledge of SOS can be derived. Further, we can safely come to the conclusion that SOS can more effectively meet the challenge of complex giant systems. At last, applying SOS, current support systems are considered.