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Purification of indoor polluted air becomes a common concern topic along with living standards enhancement. As the top killer of indoor polluted air, the formaldehyde pollution was of special concern. The origin of formaldehyde and its enormous pollution in indoor air were inevitable so it was very import to purify indoor air formaldehyde. Compare with technology of physical absorption, chemical absorption, photo catalytic, biodegradable, the purification of formaldehyde by plant was natural, environmental and easy operate,which became the hot topic and advanced science in the research of purification of indoor formaldehyde and houseplant landscape.This thesis chose Scindapsus aureus, short leaves Sansevieria and Chlorophytum three common indoor ornamental plants as the main material and studied effect of the biological factors, climatic factors, atmosphere factors, soil factors on the performance of the purification of formaldehyde by the three plotted plants in the fumigation chamber, and then, the three species of plants was used to purify the formaldehyde released from E1 and E2 grade of HDF. The results showed that:(1) Scindapsus aureum, Sansevieria and Chlorophytum three potted plant have good performance of purification formaldehyde in the air, the performance of purification formaldehyde among three plants: Scindapsus aureus>Sansevieria> Chlorophytum.(2) In different time a day, the performance of purification formaldehyde of plants are different, from early morning start, with the light intensity increases, the performance of plants to purify the increasing trend of formaldehyde into the night, the plant can reduce the absorption of formaldehyde purification trend.(3) The effect of temperature on the scindapsus aureus purification performance of formaldehyde is significant, as the temperature rising, the purification performance of formaldehyde by potted plant enhances between 8℃and 28℃.(4)With increasing initial concentration of formaldehyde, the purification performance of formaldehyde by scindapsus aureus increased, when the amount of formaldehyde injection is16μL, the purification performance of formaldehyde is best, this time, the average amount of purification performance of formaldehyde is 0.80μL per hour by one pot of scindapsus aureus. With unceasingly increasing initial concentration of formaldehyde, the removal rate of formaldehyde by scindapsus aureus reduced. When the initial injection is to 32μL, the scindapsus aureus appears formaldehyde poisoning.(5) Combination with air purification method and plants purification method, the purification performance of formaldehyde by plants is prominent. When the initial injection is to 8μL, the concentration of air free formaldehyde in the air cabinets is 0.07mg/m~3 after 10 hours through access with 0.2 m~3/h fresh air, less than "Residents of formaldehyde in the air health standards " which required 0.08mg/m~3.(6)The effect of the composition of Soil on the purification performance of formaldehyde by plants is influential, the water and soil have some capability to purify air free formaldehyde, and adding activated carbon and titanium dioxide to the soil, the purification performance of formaldehyde by potted plant enhance.(7) When E1 and E2 grade of HDF was placed in the closed cabinets, concentration of air free formaldehyde first increased and then decreased in the closed cabinets where they placed with plants.The Chlorophytum, Sansevieria and Scindapsus aureus had outstanding purification performance of air free formaldehyde released from the high.density fiberboard in the closed cabinets. In the Scindapsus aureus closed cabinets, the maximum concentration of air free formaldehyde is 0.15 mg /m~3,only 30% of control (0.50 mg/m~3) when placing E2 grade of HDF, after 12h purified, the concentration of air free formaldehyde in the cabinets is 0.06 mg/m~3, which is less than the "Residents of formaldehyde in the air health standards " requirement. While in the Sansevieria and Chlorophytum closed cabinets, the maximum concentration of air free formaldehyde is 0.27 mg/m~3, but after 4 days the concentration of air free formaldehyde is down to 0.08 mg/m~3, meet requirement of "resident of formaldehyde in the air health standards". The concentration of air free formaldehyde in the closed cabinets, which placed with a piece of E1 grade high.density fiberboard, can meet the requirements of "resident health standards for formaldehyde in the air", after a period of time placed with Sansevieria and Scindapsus aureus.
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