  Traditionally, Double Sine-Gordon Equation (DSGE) is seen as a nonintegrable
equation. That means we cannot find general solutions in asymmetry DSGE. In
this paper, we develop analytical method to solve this equation by Mobius
transformation. And finally, this can reduce the problem to find roots of
polynomial of four degree in one element. We have known this can be solved by
square formally because its degree less than five. Although complexity as a
solution, but in this sense, we can say we formally solve this nonintegrable
equation.
