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The yield-related characters of 46 indica rice cultivars were analyzed in Nanning and Sanya to elucidate their changes in the process of off-season breeding in Hainan. The results indicated the value of plant height, flag leaf length and panicle length become smaller from Nanning to Sanya. While the value of setting rate, 1000-grain weight and yield per plant turned higher. The correlation among plant height, panicle length and yield per plant, and the correlation between panicle number and yield per plant were significantly or very significantly positive in both test points. The first principal component was regarded as yield factor, and the second and fifth principal component was regarded as panicle number factor or retting factor in both test points. The forth principal component was leaf width factor in Nanning, and was 1000-grain weight in Sanya. In addition, the breeder should pay more attention to the traits such as plant height, panicle length, panicle number and setting rate to use off-season breeding in Hainan for rice breeding. [ABSTRACT FROM AUTHOR]