Abstract: Aimed at the principal limiting factors of vegetation restoration in dry valley of upper reaches of Minjiang River, field experiments and plot fixed observations had been conducted for three years. The optimal soil environment control techniques for vegetation restoration in large area were as follows. Before rain season in first year, site preparation along horizontal trench, digging moderate holes, and then, cultivating Astragalus hungheensis were carried out. When rain season in second year coming, Pfertilizer was applied in holes, and tree seedlings were planted. Alternatively, before rain season in first year, site preparation along horizontal trench and digging moderate holes were carried out. When rain season in second year coming, Pfertilizer was applied in holes, tree seedlings were planted, and all holes were covered by stones. These techniques were easily practicable, and expended in the region.

Key words: Vegetation restoration, Environment improvement, Optimal technological measure, Minjiang River, Dry valley, Astragalus hungheensis, fishery resources, probability of detection, sample size, diversity of species, optimization