Based on thin Nb5N6 film，whose temperature coefficient of resistance （TCR） is as high as-0.7% K-1 at room temperatures，a bolometer integrated with a planar bow-tie antenna has been designed and fabricated for detecting signals at 100GHz without cooling.The best attainable electrical responsivity of the bolometer is about-400 V/W at bias current of 0.4 mA.The electrical noise equivalent powers （NEP） is 1.5（10-11W/Hz for a modulation frequency of 200 Hz and 9.5（10-12W/Hzfor the modulation frequency above 10kHz.