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Recent progress on research activities of phase diagrams in our laboratory has been presented. Experimental studies and thermodynamic calculations based on CALPHAD (Calculation of Phase Diagrams) method have been conducted in the following alloy systems.1. Database on microalloying steels including carbide, nitride and sulfide is now being constructed.2. ADAMIS (Alloy Database for Micro-Solders) containing 8 elements of Ag, Bi, Cu, In, Sb, Sn, Zn and Pb has been constructed, which can handle all combinations of these elements and all composition ranges.3. A thermodynamic database of Cu-base alloys including Cu-X binary system and Cu-Fe, Cu-Ni, Cu-Cr base ternary systems has been constructed.4. Experimental and thermodynamic calculations on Fe, Ni, Co and Ti aluminides have been conducted.5. Experimental and thermodynamic calculations on Co base magnetic recording media have been conducted.6. Thermodynamic analysis of interaction between magnetic and chemical orderings has been performed.By utilizing the information on phase diagrams, the following advanced materials have been developed. (A) Newtype of high speed steel with high hardness about Hv≈1000 by carbide dispersion carburizing method. (B) New Pb-freemachinable stainless steel using titanium carbosulphide. (C) New Pb-free solder for Die-attaching use. (D) Shape mem-ory alloys; Cu-base, Ferromagnetic Ni-base and Fe-base. (E) Invar alloys. (F) Egg-type powder.Typical examples of phase diagrams, phase stability, database and its application for the development of advancedmaterials will be presented.