Three years experiments were conducted on transformation of timber-shoot use bamboo (Phyllostachys heterocycla cv. pubescens) stands on north slope and canyon into large diameter bamboo one by increasing stand density and selecting larger shoots for growth. The result indicated that the average DBH of new bamboos reached 11.76cm, 0.93cm larger than before. Gilms with DBH over 12cm occupied 55.8%, about 18% increase of that of before. Timber yield increased by 34.3% than before, and that of bamboo with DBH over 12cm by 14.8%. New bamboo output value every two years increased by 36.6% than before.%通过3年来对朝北的山坡或山岙地的笋竹两用林林分采取增加竹林密度和选粗壮的竹笋留养新竹的技术培育毛竹大径竹材,结果表明:新竹平均胸径达11.76 cm,比实施前提高了0.93 cm;胸径≥12 cm立竹株数达55.8％,比实施前提高了近18百分点；林分立竹竹材产量比实施前增加34.3％；胸径≥12 cm立竹竹材产量提高了14.8％；每度新竹立竹产值比实施前增加36.6％.
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