This is my earliest paper analyzing the influence of spacetime structure changes on the gravitational constant. In the process of establishing the model, some calculation errors were found, so the model was changed and several papers on the influence of Jupiter on the measurement of the gravitational constant were published a few days ago. Now it seems that the new model that was subsequently established actually has serious problems, so now I try to change back to the original model for analysis. Although the two models are very different, they can obtain basically the same results in analyzing the influence of Jupiter on the gravitational constant. This article believes that the accumulation of electrostatic energy in matter is the basic origin of spacetime. Since the distribution of electrostatic energy produced by matter is very wide, for a matter of a large mass like a star, the accumulated electrostatic energy distribution can reach a range of one or two light-years, which is very huge relative to the mass distribution of stars. However, due to the motion of some huge planets, such as Jupiter, the electrostatic energy distribution structure of galaxies like the entire solar system, that is, the spacetime structure, will change. This change in the spacetime structure will result in the changes of the gravitational constant measured on the earth. In addition, due to the elliptical orbit of the earth, the earth appears at different positions in the spacetime structure, which brings greater uncertainty to the measurement of the gravitational constant on the earth. The analysis results of this paper show that the change of the gravitational constant caused by the change of the spacetime structure can explain the large error of the measurement result of the gravitational constant to a certain extent.