Abstract: Two azalea (Rhododendron mucronatum) cultivars, under various relative light intensity (Rli) , were studied. Lower activity for catalase (CTA) and peroxdase (POX) , and higher content for reduced Vc tanin and polyphenol were found in habitats under Rli>65%, also with higher flowering index and more tolerent to adverse environmental conditions. Thus, the habitats under Rli>65%, were favourable for the growth and development of azalea. The activity of POX and CTA, and the content of tanin and polyphenal, and the reduced Vc in plant leaves could be considered as the criterion to dotermine whether the habitats were fit for their favourable growth and development.