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The family construction and rearing techniques for Nile lilapia were studied by nested mating design and rearing technique, and three Nile tilapia population were used to initiate the breeding program by nest mating design. At the early breeding stage of rule tilapia, the environment standardization and the first, second, and third quantity standardization were demanded to carry out the program. There were 30 full -sib families of Nile tilapia on the study. "When the fry was 60 days, growth traits of each family were measured and analysed. The results show; the average weight of 30 families was 40. 59 g. Average weight of family VI-2 was the largest, the number was 60. 90 g. Average weight of family VII-3 was the least, the number is 29.51 g. There were 14 families, and their average weight were more than the overall average. The number of average weight of VIII-2 was consistent with the overall average. And the number of the others families average weight were lower than that of the overall average. The result supplied a reference for the large-scale family breeding program of Nile tilapia. [ABSTRACT FROM AUTHOR]