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In the present calculation of the inner solution of gravity field equationwith spherical symmetry, in order to avoid the singularity appearing in thecenter of sphere, we actually let the integral constant to be zero. It isproved in this paper that the constant can not be zero. The metric of innergravity field of hollow sphere is calculated at first. Then let the innerradius of hollow sphere become zero, we obtain the metric of inner gravityfield of solid sphere. Based on the definition of energy momentum tensor ofgeneral relativity, the gravity masses of hollow and solid spheres in curvedspace are calculated strictly. The results indicate that no matter what themasses and densities of hollow sphere and solid sphere are, space-timesingularities would appear in the centers of spheres. Meanwhile, no matter whatthe mass and density are, the intensity of pressure at the center point ofsolid sphere can not be infinite. That is to say, the material can not collapsetowards the center of so-called black hole. In stead, it may be that thereexist the spherical surfaces of infinite pressure inside the hollow and solidspheres, and material would collapse toward the surfaces so that the commonspheres are unsteady. At the center of solid sphere and on its neighboringregion, pressure intensities would become negative values. There may be aregion for hollow sphere in which pressure intensities would become negativevalues too. The results only indicate that the singularity black holespredicated by general relativity are caused by the descriptive method of curvedspace-time and can not exist in nature actually. If black holes exist really inthe universe, they can only be the Newtonian black holes, not the Einstein'sblack holes.

The Precise Inner Solutions of Gravity field Equations of Hollow and Solid Spheres and the Theorem of Singularity