Scientific object of classical satellite geodesy is the determination of the geometric figure, orientation and their variations of the earth. Main practices of modern satellite geodesy are in the field of positioning on the earth surface with a relative precision of 1 part per billion and consistentover decades. Whereas the object of modern satellite geodesy is far beyond the object and the practices mentioned and become a interdisciplinary geodetic science. Now the modern satellite geodesy can provide and process the information necessary for other geosciences, such as geodynamics, planetology, atmospheric sciences, oceanography, tectonic movement and glaciology and so on. The modern satellite can also provide the data which are usually difficult collected and achieved by the other geosciences mentioned. Now the valuable data may solve some problems which are difficult solved in these geosciences before. As a matter of fact the influence of modern satellite geodesy is enlarging, with impressive achievements in the last few decades in many diverse areas, and becomes an interdisciplinary geoscience, and it will give more influence and promotion on the other geosciences, planet sciences, and environment sciences. Examples include enabling determination of crustal deformation and strain with unprecedented accuracy at high time resolution; water vapor monitoring; satellite orbit determination; gravity modeling and its variation with time. Of course in order to meet this objects there are a lot of theoretical and practical problems in satellite geodesy are still to be solved. However it will be sure satellite geodesy will not only be taken as a powerful position in geodesy but also in geosciences.