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In recent years satellites of small sizes have been in development. Since electronic components are miniaturized and efficient, it is possible to develop satellite of small dimensions. The spirit of development of the small satellite in the world has been encompassed by the slogan “faster, better, smaller, cheaper”. The classes of satellite, which have the mass ranging from 10–100 kg, is called the micro-satellite. There are number of analysis like sensitivity analysis, vibration analysis, dynamic analysis and thermal analysis to be carried out in the development of the micro satellite both theoretically and experimentally. This paper discusses the free vibration analysis of a micro-satellite of mass less than 60kg. The micro satellite considered for this analysis is a spinning cuboids structure of 600mmx600mmx600mm dimensions with 18 subsystems positioned so as to meet the C.G and M.I. constraints.