The primitive mantle of the earth was in a high temperature global melt state. The cooling-evolution process of the upper layer of the primitive mantle could be divided into 3 phases: (1) a phase of crystallization-accumulation of minerals with high melting temperatures, (2) a phase of silicate liquid immiscibility and (3) a phase of melt solidification. During the process of the cooling-evolution,volatile components were released from the primitive mantle to have formed the supercritical fluid sphere later. The magma rich in Si-Al, which were formed by silicate liquid immiscibility, were solidified to form the primary crust. The supercritical fluid sphere was then decomposed to have formed acidic hydrosphereand CO_2 aerosphere respectively.