Keeping in view large acreage of Indian mustard under conserved residual moisture - rainfed condition on farmers' fields, the present study entitled "Stability study on basal and non-basal branching genotypes of mustard (Brassica juncea L. Czern & Coss) under different condition" was undertaken with 20 genotypes from 10 AICRP-R&M centres conducted in Randomized Complete Block Design in three replications under four environments viz, no irrigation under Rainout Shelter (E1), rainfed (E2 ), one irrigation : 45 DAS (E3 ) and two irrigations: 45 and 65 DAS (E4 ), and evaluated for thirty - three morpho-physiological traits along with laboratory experiment for drought related physiological traits. NRCDR-2 (M-Nbb, Variety 2007) is the most stable genotype in poor whereas popular variety Rajendra Suphlam (BB) stable in average environments can be suggested to farmers for residual moisture - rainfed condition.