Abstract: The research selected 6 species of plants such as Epipremnumaureum ， Sansevieria trifasciata ，Hedera nepalensis var. sinensis ，Maranta leuconeura ，Chlorophytum comosum and Aloe vera var. Chinensis ， and used airtight fumigation method to undergo ammonia stress with different concentrations. The leaf green content，malondialdehyde content and the relative electrical conductivity were tested for the above plants. The results showed that under 1，2，4 mg/m3 ammonia concentration stress，the Epipremnum aureum and Hedera nepalensis var. Sinensis had strongest ammonia pollution resistance， medium for Maranta leuconeura and Sansevieria trifasciataLanrentii ， the weakest for Chlorophytum comosum and Aloe vera var. Chinensis .

Key words: ornamental plant, indoor air, plant purification, ammonia stress, physiological resistance