Abstract: In order to explore the effect of altitude and canopy-shade on the size of Fargesia denudata, the plant size (basel diameter and plant height) and shape index had been surveyed within Laohegou Nature Reserve, Pingwu County, northwestern Sichuan. The results showed: the basel diameter, plant height and shape index of Fargesia denudata within Laohegou Nature Reserve were 8.65 ± 1.67 mm, 243.2 ± 62.8 cm and 282.4 ± 53.6, respectively. And the Plant size and shape had certain plasticity, and been significantly affected by altitude and canopy-shade. The F. denudata from higher altitude had higher basel diameter and height. Canopy shading was conducive to F. denudata to grow higher and slenderer while F. denudata grew shorter and smaller.The present study highlighted that the Fargesia denudata could adapt to higher altitude and grew larger, the plant within the canopy-shade were slender than that from the sunny, which would help to manage the bamboo grove for giant panda.