The study aims at examining the main determinants of human labour use in Bihar. Intensity of cropping and machine labour utlization were main determinants of human labour utilization in the project area. An increase of 10 per cent each in machine labour.utlization and. intensity of cropping would result in the increase in human labour utilization by 4.81 per cent and 11.43 per cent, respectively. . The study.fluffier reVealed that the wage rate, net cultivated area and in-hutted area luid positive and skunificant.influence on hired hum in ktboUr utilization, whereas percentle area under shire crotiping and family labour utilization had negative influence on hired human labour utilization. An increase of 10 per cent each in wage rate, net cultivated area and percentage area under irrigation would . increase the lured human labour utilization by 10.80 per cent, 3.28 per cent and 2.27 per cent, respectively on sample households.