The paper aimed to determine yield and estimate pea grain yield stability of newly-created lines JSG-1 (cultivar in recognition process) as well as compare with foreign origin cultivars in agroecological area of east Slavonia. The trial was set up by a randomized block design on the experimental field of Agricultural Institute Osijek in four replicates in the five-year period (1998 – 2002). Six (five foreign and one inland) cultivars were included by the trial: Eiffil, Erbi, JP-5, JSG-1 (in a

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... cognition process), Torsz and Baccara. Stability parameters were calculated by the grouping method after Francis and Kannenberg (1978) and by the model of individual stability estimation after Eberhart and Russel method (1966). According to Francis and Kannenberg, cultivars Eiffil, Erbi, JSG-1 and Baccara belonged to group I known for high yield and low trait varying coefficient, thus, represent stabile yield cultivars. According to regression coefficient and regression deviation variance the most stabile cultivar appeared to be cultivar JSG-1 (bi =1.06 and S2 di=0.010) and the lowest one was Torsz (bi =0.67 and S2 di =0.160). Cultivar Baccara (bi = 1.22 and S2 di =0.034) was comprised by the group of unstabile and adaptible for high-yielding environments.