Abstract: Effects of titanium on the microstructure and properties of hot stamp-formed steels containing boron were studied by drawing CCT curves, hot rolling test and direct quenching test.The results show that adding 0.015wt% titanium could increase the hardenability of the tested steels, and thus got full martensitic microstructure at a lower cooling rate of 10 ℃·s-1. The strength and hardness of the hot rolled sheets after quenching could be increased after adding 0.015wt% titanium, and the distance of martensite lath could be decreased from 0.35-0.54 μm to 0.12-0.25 μm.