Effect of the Ga content substituting the Fe on the crystal structure and magnetic properties of the Nd2(Fe,Co)14B/(Fe,Co)3B+(little)α-Fe permanent magnetic materials is studied. The change mechanism of magnetic properties of the dual-phase nanocrystalline magnets is discussed.The results show that the crystal size was markedly decreased by adding Ga. With the increase of x, the dependence of the Br and the (BH)max on annealing time undergoes a chang from two-peak curves to one-peak curves in the Ga content range of xj Hc decreases at first to a minimum and then increases slowly. The best value of the magnetic properties is obtained at x=0.2.