Rice is major cereal crop for food and nutritional security of Nepalese people. The study aimed screening of superior genotypes based on quanitative traits for irrigated condition. The research was carried out at National Rice Research Program (NRRP), Hardinath in 2019. The augmented randomized complete block design was adopted with six blocks. The study tested ninety advanced breeding materials developed through conventional breeding method as testing materials and six released varieties as replicated checks. The yield attributing traits such as days to heading, days to maturity, plant height, panicle length, filled grain percentage per panicle and grain yield ton per ha were recorded. ANOVA, descriptive statistics, genetic variability and cluster performance were determined to the studied traits and genotypes. All traits showed significant differences among genotypes at 1% and 5% level of significance due to different genetic loadings of parents used in crosses. The highest GAM, PCV and GCV recorded for grains yield per ha. Broadsense heritability recorded highest to phonological traits followed by filled grain percentage, plant height and panicle length. The grain yield had positive and highly significant (p<0.01) relation with filled grain percentage. The phonological traits showed positive and highly significant correlation with each other. A circular dendrogram based on five traits (MD, PH, PL, FGP, AGY) grouped into seven clusters. Cluster 1, 2, 3 and 5 grouped early maturity type, good filled grain percentage, short plant height, and high yielding with good filled grain percentage genotypes, respectively. The high heritability coupled with genetic gain helps in precise selection of traits for further improvement. High heritability coupled with genetic advance and GCV values found for days to heading, days to maturity, filled grain percentage and plant height. This allows the selection of these traits directly for improvement because of presence of additive gene action.