Thirteen new promising lines in addition to two commercial cultivars of garden pea (PisumsativumL.) were evaluated under six environments in Lower Egypt(two seasons of 2013/2014 and 2014/2015,and three locations).Data were recorded for plant length, no. of days to flowering, pod length, pod weight, no. of seeds/pod, 100-seeds weight, shelling percentage and total green yield. The linear response of genotypes to environments was highly significant for all studied traits. The mean squares due to Environment + (Genotypes × Environment) was significant for all studied traits. The results of stability analysis indicated that the genotypes G1, G5, G6 and G13, most stable genotypes, gave the maximum total green yield overall the six studied environments and were adapted to environments fortotal green yield and moststudied traits. Also, the genotype G10can beconsidered promising line as early and short stem length cultivardue to its performance and stability for total green yield and most studied traits.The genetic similarity coefficients among garden pea genotypes evaluated by SCOT markers varied from 68.4% to 99.6%, indicating high level of genetic diversity existing among the pea genotypes which could be valuable for pea breeding in the future. The dendrogram generated with hierarchical UPGMA (Un-weighted Pair Group Method with Arithmetic Averages) cluster analysis of the Jaccard's similarity coefficient matrices revealed two major clusters.