A hot stamping process, characterized by comprising the steps of: a) providing a steel sheet or its preformed component, wherein the steel sheet comprises by weight percent 0.18 ∼ 0.42% of C, 5 ∼ 8.5% of Mn, and 0.8 ∼ 3.0% of Si + Al, optionally comprises at least one of the following components: 5% or less of Cr; 2.0% or less of Mo; 2.0% or less of W; 0.2% or less of Ti; 0.2% or less of Nb; 0.2% or less of Zr; 0.2% or less of V; 2.0% or less of Cu; 4.0% or less of Ni; and 0.005% or less of B, with the balance being Fe and unavoidable impurities, wherein the alloy elements of the steel sheet enable the actual measured value of the martensitic transformation start temperature of the steel sheet after hot stamping to be ≤280°C; b) heating the steel sheet or its preformed component to a temperature ranging from 700 to 850°C; c) transferring the heated steel sheet or its preformed component to a die for stamping so as to obtain a formed component; and d) cooling the formed component to a temperature that is 150 to 260°C below the martensitic transformation start temperature point by any cooling method and under any cooling condition, a tempering heat treatment step is conducted after the step d), in the tempering heat treatment step, the formed component is heated to a temperature ranging from 160 to 450°C and then maintaining the temperature for 1 to 100000 seconds, and then cooling the formed component to room temperature by any cooling method and under any cooling condition, wherein the tempering heat treatment step is conducted immediately after the step d) or after the formed component that has been subjected to the step d) is placed for a period of time. a) providing a steel sheet or its preformed component, wherein the steel sheet comprises by weight percent 0.18 ∼ 0.42% of C, 5 ∼ 8.5% of Mn, and 0.8 ∼ 3.0% of Si + Al, optionally comprises at least one of the following components: 5% or less of Cr; 2.0% or less of Mo; 2.0% or less of W; 0.2% or less of Ti; 0.2% or less of Nb; 0.2% or less of Zr; 0.2% or less of V; 2.0% or less of Cu; 4.0% or less of Ni; and 0.005% or less of B, with the balance being Fe and unavoidable impurities, wherein the alloy elements of the steel sheet enable the actual measured value of the martensitic transformation start temperature of the steel sheet after hot stamping to be ≤280°C; b) heating the steel sheet or its preformed component to a temperature ranging from 700 to 850°C; c) transferring the heated steel sheet or its preformed component to a die for stamping so as to obtain a formed component; and d) cooling the formed component to a temperature that is 150 to 260°C below the martensitic transformation start temperature point by any cooling method and under any cooling condition, a tempering heat treatment step is conducted after the step d), in the tempering heat treatment step, the formed component is heated to a temperature ranging from 160 to 450°C and then maintaining the temperature for 1 to 100000 seconds, and then cooling the formed component to room temperature by any cooling method and under any cooling condition, wherein the tempering heat treatment step is conducted immediately after the step d) or after the formed component that has been subjected to the step d) is placed for a period of time.