Based on the microscopic phase-field dynamic model and the micro-elasticity theory, the pre-precipitation process of Ni75Al14Mo11 alloy was simulated at 973 K. The investigation of the microscopic morphology evolution figures, the change of L10 volume fraction, order parameter and occupation probability indicate that the first precipitation is L10 structure which has two variants of L10(I) structure and L10(II) structure. With the increase of the elastic strain energy, the precipitation of two L10 structures are affected, and the elastic strain energy, obviously, inhibits the formation of the L10(I) structure. At last, the two L10 structures transform to precipitation of L12 order structure