If spacetime are considered as an elastic medium, this elastic medium will be able to be compressed. The analysis in this paper shows that if spacetime is compressed, it will cause a change in the gravitational constant. From the theory of general relativity, it is mass that can compress this elastic medium. In the solar system, 99% of the mass is concentrated in the sun. However, about one thousandth of the mass of the sun is concentrated in Jupiter. The position on the same side of the Sun and Jupiter, that is, near the center of mass of the two bodies of the Sun and Jupiter, is the position where the mass of the solar system is most concentrated in spacetime. Therefore, this part of spacetime will be compressed the most. If a planet like the earth moves to this position, it means that the gravitational constant measured by the experimental device on the earth's surface will change. The estimates in this article show that the gravitational constant of the earth moving between Jupiter and the sun is greater than that of the earth on the other side of the position of the sun and Jupiter. The specific estimated increased value is about 77ppm of the gravitational constant, which is higher than the uncertainty of many current measurements. This paper analyzes the HUST-09 results with the results of theoretical estimates, and believes that this method can explain the difference between the two experimental results.