In order to research the Zn-polyaniline secondary battery life cycle impact factors, the five factors of influence on the cyclic life for Zn-PANi secondary batteries have been investigated electrochemically, which include materials degradation of the positive electrode due to overcharge, passivation of the negative electrode, dendrite formation, corrosion of the current collector and drying up of the electrolyte. The test results indicate that the main influence factor is the short-circuit aroused by the dendrite formation on the negative electrode, which enable the battery to have the life of only 70 cycles. Secondly, the degradation of positive electrode by over charge causes the self-discharge of battery, which reduces the battery cycle life significantly. In addition, the drying up of electrolyte, the passivation of the negative electrode and the choice of the current collector, all these bring about influences to the cycle life of battery to a certain extent.