Abstract: To study the equilibrium stability of the bubble connecting device，the concept of bubble

coordinate is introduced.Basedon this，the minimum energy method is used to quantitatively analyze

the influence of bubble's initial state on bubble's equilibrium stability. The results are in full

agreement with the qualitative analysis. Mean- while，the experiment shows that the error between

the results of numerical computation and the experiment results are very small. So the validity

and accuracy of the equilibrium stability analysis of the bubble connecting device by using the

minimum energy method are verified.

Key words: bubble coordinate, surface energy, equilibrium stability analysis, minimum energy method