Review of space information technology

The features of information technology (IT) are discussed first. On this basis, the features of space information technology (SIT) are presented and SIT is elaborated in five categories. The popularization of SIT is an informatization process and will promote the industrialization of national economy and the modernization of industry such as agriculture. The necessity of the synthetical application of SIT is studied emphatically, and the development trend of SIT is discussed.