Earth's density flattening and hypothesis of latitudinal normal density

In this paper, the definition of latitudinal density and density flattening of the level ellipsoid is given, and integral formulas of latitudinal dens ity for pole gravity and equator gravity are derived. According to the pole gravity condition and equator gravity condition for the level ellipsoid, l atitudinal density distribution function of the level ellipsoid is obtained . It is proved mathematically that latitudinal density of the earth's equat or is larger than that of the pole, the earth's density flattening calculat ed preliminarily is 1/322, and hypothesis of the earth's latitudinal normal density is further proposed, so that theoretical preparation for studying the forming cause of the earth gravity in problems such as continent drift, mantle convection, and submarine extension is made well.