Abstract: Current research on controlled nuclear fusion concentrates mainly on magnetic confinement fusion(MCF) and inertial confinement fusion(ICF). So far it has not been determined which will be better operationally. This article analyses both MCF and ICF, points out their difficulties, and presents a new idea for the 3axial 6polar magnetic mirror system, which may turn out to be cheaper and simpler. With it, we may be able to combine MCF with ICF to achieve our target of controlled nuclear fusion.