Abstract: Abstract: The traditional high chromium cast iron is made by gravity forging, but this method often has some problems such as forging failure and model cracking, so a liquid die forging method is proposed. Through the design and process parameter analysis of the die in the process of liquid die forging, the purpose of optimizing the process and improving the performance of the die is achieved. At the same time, the use of heat treatment to improve the actual performance of liquid metal is studied. The results showed that the hardness of the metal reached 56.8HRC at 530℃ after heat treatment, and the hardness of the metal increased by 7.1HRC. The impact toughness of high chromium cast iron metal can be up to 24.8J/cm2. Metal that has not been superheated will have more cracks and voids. After process optimization, the shrinkage probability of liquid die forging is the lowest 0.01%. After simulation by different processes. The forging defect rate of the die is effectively controlled. It can be seen that the metal properties of high chromium cast iron after heat treatment can be effectively improved, and the mold properties after process optimization can also be effectively improved. It has a good guiding significance for the optimization of liquid die forging process of high chromium cast iron and the improvement of forging die performance.