Aimed at the problem of most of the gear fault signals are the multicomponent AMFM signals which are very difficult to decompose, a new signal processing method of the full vector of local mean decomposition (FVLMD) was proposed. A multicomponent signal was adaptively decomposed into a complex of series of singlecomponent signals by using the local mean decomposition (LMD). The problem which singlechannel signal was usually not complete was solved by the full vector spectrum technology. By using the information fusion technology, the PF (Product Function) component decomposed by LMD was fused with analysis by the full vector spectrum. So the signals can not only be decomposed completely, but also their integrity can be ensured. Its effectiveness and feasibility are verified through the gear fault signals.