INTRODUCTION
Peach is one of the important fruit tree cultivars in China.Such a crop benefits from light, and therefore, light interception of tree canopy is crucial for the external and internal fruit quality, such as fruit size, color, soluble solids content, and titratable acidity (Jiang et al. 2003; Widmer and Krebs 2001; Zhang et al. 2005; Lu et al.2003; Zhang et al. 2001; Wagenmakers and Callesen1995). Light interception is directly related to leaf area and the spatial distribution of branches and leaves within the canopy geometry, thus influencing the fruit yield and natuml life of a tree. So, improving light distribution