The properties of phase-matching (PM) faces for sumfrequenoy generation (SFG) are analysed according to the refractive indices and phase-matching conditions of two funamental waves and their second-harmonio wave in normal accentrio biaxial crystals. We derived 29 PM topologio diagrame and existing conditions, 15 non-critical phasemsyvhinh (NCPM) topologio diagrams, existing conditions and polarization relations. The topology and NOPM conditions for SFG in LAP and KB5 are also presented.