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A new V-Ti-Mo complex micro-alloyed hot-rolled high strength sheet steel was developed by controlling a thermomechanical controlled processing(TMCP)schedule,in particular with variants in coiling temperature.At coiling temperature of 600,the experimental steel has the best mechanical properties: ultimate tensile strength(UTS)1000 MPa,yield strength(YS)955 MPa and elongation(EL)17%.Furthermore,the contributions of precipitation hardening and grain refinement hardening were high to about 310 and 361 MPa,respectively.The steels developed were mainly strengthened by a combined effect of ferrite grain refinement hardening and precipitation hardening.The variation in contribution of precipitation hardening increment caused a significant difference in YS.