The present invention relates to a steel sheet used for hot stamping, a hot stamping process and a hot stamped component. The steel sheet used for hot stamping is characterized in that the steel sheet comprises, by weight percent, 0.18ˆ¼0.42% of C, 4-8.5% of Mn and 0.8ˆ¼3.0% of Si+Al 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. The method for manufacturing the hot stamped component comprises the steps of: heating the material to 700ˆ¼850 °C and then stamping; cooling it to the temperature that is 150ˆ¼260 °C below the martensitic transformation start temperature point by cooling in a die, cooling by air, cooling by water or other cooling methods; heating the stamped component to a temperature ranging from 160 to 450 °C and maintaining the temperature for 1 to 100000 seconds for tempering heat treatment, and then cooling the stamped component to room temperature. The formed component obtained according to the present invention has a yield strength of ‰¥1200 MPa, a tensile strength of ‰¥1600 MPa and a total elongation of ‰¥10%.