This article concerns that the plants have expressed a higher intensity of ,,net photosynthesis and played a more significant role in keeping equilibrium of carbon-oxygen in non-polluted region than in pollutad region.In order to maintain the equlibrium of carbon and oxygen for man to breathe, it was necessary to possess Ficus carica (6.6 trees),Broussonetia papyrifera(4.9 traes) and Liqust-rum lucidum(12.1 trees) in clean area,while 35,6.8 and 51.9 trees respectively in polluted area. The absorption capaci...