In conventional semi-solid casting both Thixo-casting and Rheo-casting, there has a limit in use of alloy and a difficulty in controlling a globular microstructure and its grain size that will lead to a lower mechanical properties. Furthermore, the inefficiency in production cost and productivity are still a disadvantage in commercialization. In this paper, a quick and easy semi-solid slurry manufacturing process called "Nanocast method" will be introduced. By this method, various alloy systems ex. ADC5, ADC6, ADC10, AC4C and AC2A etc. can be used. Furthermore, tool life ex. shot sleeve, plunger tip and die life will be extended because of low melt temperature and slow shot speed injection. Resulting in working environment improvement and energy saving. The application of this method in die casting and forging will be introduced also.