The selection of high yielding varieties with good stability is an important objective in rice breeding programs. The grain yield of eight rice lines with a check (Nemat) were compared on six locations of Gilan and Mazandaran provinces during two years, using RCBD with four replications. Combined analysis of variance showed that the effect of variety and year × location × variety interaction were significant. Nine stability analysis methods were used in this research. Line No. 7 with environmental variance method and Line No. 1 with four stability methods (such as coefficient of variability of environment, wricke’s equivalence, Shukla’s stability variance and coefficient of determination) were most stable lines. The line No. 5 based on within location variance and within location C.V. parameters and Line No. 4 using coefficient of regression of mean yield on environmental index and variance of deviation from linear regression, were known as the most stable lines. Consequently, lines No. 7, 1, 5 and 4 were the most stable ones using different methods. In this research, Lines No. 4, 1 and 5 were selected because of high yield and stability. However, because of the desired grain quality and morphological traits, line No. 4 was released as a new rice variety (Kadus) by the Agricultural Research and Education Organization in 2004.
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