Abstract: Because of the needs of the function and structure of a space-craft,it always have certain magnetic properties.The spacecraft magneticproperties may disturb the attitude of the spacecraft and may affect the perfo-rmance of the sensitive instruments,aboard,thus,must be controlled in theprocess of a spacecraft design and development.In this paper,space magne-tic field and the sources of spacecraft magnetic properties are briefly presen-ted.The design criteria and test methods are emphatically clarified for con-trolling spacecraft properties.