Abstract For fabricating a dense and superconducting bulk MgB 2 samples, a synthesis technique was employed. Our experimental results show that there is a suitable sintering temperature range, say from 800 to 850 °C. In this temperature range, the critical temperature of the samples is 38 K above, and the superconducting transition is sharper than that of those sintered out of the range. The temperature dependence of resistance of MgB 2 in high temperature region was also measured. The temperature dependence of the resistance, at temperature lower than 700 °C, obeys a form of a+ bT n , where n∼2.9. However, the resistance of the sample exhibits a negative temperature coefficient, as T is higher than 700 °C. This indicates that MgB 2 has semiconducting behavior.