As is known to all, The force that causes solar radiation and solar activity comes from the Sun's Interior, in addition, its internal properties are complex and changeable, the pressure distribution inside the sun is therefore critical to study the state,the motion of internal material and the internal structure of the Sun. In order to get the distribution of the pressure inside the sun, the "fluid statics equation" is used to study the distribution function of the density and pressure of the sun by dimensionless parameter-based, assuming that the density of the sun is spherical symmetry distribution, considering the boundary conditions, and finally fitting the distribution curve of the density and pressure of the sun. The results show that the central density and the pressure in the Sun's core, which are respectively 1.6240×105 kg·m-3 and 3.4606×1016 Pa?respectively. It can be seen that this is basically consistent with the current accepted values listed in the textbooks, which is of great significance for the study of the internal properties of the sun and provides new ideas and methods for the study of the internal pressures of other stars.