In this paper, we have used a three-dimensional hybrid simulation program to calculate the process of the explosion and expansion of a large number of thermal debris ions in low density background plasma. By quantitatively calculating the variation of the magnetic bubble and the bubble constraint on the motion of the debris cloud, we have studied the influence of the background plasma charge density, the background ion atomic weight, and the charge-mass ratio of the fragment ion on the magnetic bubble. The results show that the background charge density has an important effect on the motion of the bubble and debris cloud. In the early stage of the debris cloud expansion, background ion atomic weight has little effect on the bubble expansion, but it affects the movement of debris cloud at the later time. When the charge-mass ratio of the debris ion is small, the radius of the ion gyration is larger than the bubble radius, and the bubble radius is small which cannot restrain the debris cloud. When the charge-mass ratio of the debris ion is large, the radius of the ion gyration is smaller than the bubble radius. If the background charge density is low in this condition, the early expansion of the bubble and the debris cloud is slightly affected by the charge-mass ratio of the fragment ions, and only the subsequent evolution of the system is influenced. If the background charge density is large in this condition, the charge-mass ratio of the fragment ion has a prominent influence on the motion of the bubble and the debris cloud.