The development process and characteristics of femtosecond laser were introduced briefly,the feasibility and security in ablation of Mg/PTFE composition by femtosecond laser based on its characteristics of ultrafast time and ultrahigh energy peak value were discussed.The heat transfer model in the ablation process of Mg/PTFE composition by femtosecond laser was established first,and the temperature distribution in the composition and the influence of heat released in ablation reaction on the composition wer...