As the video game developing during the time, some game mechanics playing a significant role but do not get much improvement compared to the previous. The Auto Crafting System aims to change the crafting mechanics in games which generating a random crafting tree instead of a traditional fixed crafting tree. The new crafting mechanics will help the game to manage the resources, including support the game randomly generating ingredients and recipes, build bi-relationship through ingredients and recipes, set up tie recipes and search the chance for advanced crafting. The Auto Crafting System produces a random crafting tree each game and gives players new experience with each playthrough.