The synthesis of crystalline polyaniline base using a water-in-oil type microemulsion as a medium of polymerization is reported. The polymer exhibits well defined crystalline phase whose observed orthorhombic lattice parameters are a = 7.65, b = 5.75, c = 10.22 Angstrom and V = 450 Angstrom(3). The polymer obtained has been characterized by XRD, FTIR, UV and Cyclic Voltammetry confirming the crystalline phase, surfactant stabilized nature, base form and dopability.