In the Semi-Solid Diecasters design, a Seni-Solid Diecasters experiment has usually been carried out before producing new casts. At the Semi-Solid Diecasting stages, the runner-gate part has been always repeatedly corrected, which leads to a tedious processing time and high processing cost. Much experience is essential in manual assessment and if the design is defective, much time and a great deal of efforts will be wasted in the modification of the die. In this study, a design system has been developed based on the design database In addition, a gate experiment for the gating system design has been tarried out to append the database. It is possible for engineers to make efficient gating system design of Semi-Solid Diecasting and it will result in the reduction of expenses and time to be required.