Hexagonal boron nitride (h-BN) was prepared under N2 atmosphere using improved borax?urea method. The effects of roasting temperature, soaking time, molar ratio of borax to urea on h-BN yield, purity and morphology were studied. Samples prepared under different conditions were analyzed. The results indicated that the optimum technological conditions for the synthesis of h-BN were roasting temperature of 1300℃, keeping time of 2~4 h, molar ratio of borax to urea of 1:4. Under the above conditions, the yield of h-BN was about 47% and the purity reached 98%. Moreover, the h-BN product with a particle size of 3.90 ?m composed of single particle diameter of 300~500 nm and BET specific surface area of 13 m2/g were obtained.