Abstract: The study on half-sib family's experimental forest of slash pine shows that there are obvious difference among height, diameter, volume, bole form, branch size, timber density, tracheid length and so on with changed families. At family level, the timber density was negatively ralated to volume growth while there was no obvious relation between tracheid length and volume growth. Based on constrained and unconstrained selection indexes, different demands for pulpwood and construction timber, the following integrated selection results were got:families No.0.508^#, 0.1027^#, and 2.46^# are most suitable for planting pulpwood forest; families No.0.464\^#, II-101\^# and 0.508\^# are the best selection for establishing construction timber forest.

Key words: Slash pine, Half-sib family, Inheritance and variation, Growth and wood quality, Comprehensive selection