In this experiment, compact-type maize (Xianyu335 and Zhengdan958) and flat-type maize (Jidan35 and Jidan136 ) were selected for studying on the canopy structure, photosynthetic characteristics and yield formation in different densities, exploring the reasonable composition of canopy structure of super-high-yield, determining the best types and densities of super-high-yield. The field trials were conducted at Jinsha, Huadian city(Jilin, China) in 2008 and 2009, and were adopted split plot design, five densi...