Drought is the most important abiotic stress that limits crop production of the world. A field experiment was carried out during rabi season in sandy loam soil to study the morpho physiological traits of lentil relation with grain yield under irrigated and non irrigated conditions with four genotypes viz., DPL62, PL-4 DPL-15 and NDL-1. A gradual increase on plant height was recorded in moderate tolerant genotype under irrigated and non irrigated condition. Secondary branches and biomass per plant were also recorded highest with in moderate tolerant genotypes. Maximum grain yield recorded in moderate tolerant genotype NDL-1 (6.05 and 5.69 g plant-1) followed by PL-4(5.55 and 5.10 g plant-1), DLP-62 (6.00 and 4.95g plant-1) under irrigated and non-irrigated conditions respectively. Under non irrigated condition regarding sink potential the moderate tolerant genotypes recorded less reduction in yield attributes as pod weight plant-1, seed weight plant-1, 100 seed weight and grain yield plant-1 under non irrigated condition over susceptible genotypes. The drought tolerance capacity of moderate tolerance genotypes was associated with increased the activity of catalase enzyme and total soluble carbohydrate under non irrigated condition.