[en] This study aimed at checking the stability of some mutant lines from 2 soybean varieties in different locations and to select best performing lines in each location. These lines were selected according to previous experiments as being early maturing and/or that yield higher than the control. The experiments, lasted 3 years, were grown in a RCBD with 3 replicates for each variety. Results showed significant differences between line, location and year in both earliness and yield for the two varieties. Earliness was not correlated with any character except for height and nod number on the main stem in A2522 but was positively correlated with all characters (except for 100 seed wt) in A3803. Yield was positively and significantly correlated with all characters in all lines except for 100 seed wt in A2522. IN A2522 an early maturing mutant in more than 10 days 286b was selected but was average in yield, whereas 2 other lesser degree early but have higher yield than control were selected (286a, 439). In A3803 three lines with higher yield and as early as the control were selected (634, 496 and 69). (author). 32 tabs