PP nonwovens are a new kind of cover material with better air permeability, moisture absorption and light transmission, and play the role of keeping out the cold, heat preservation, frost prevention, solar exposure prevention and so on. And they are featured of light weight, corrosion resistance, long life (4-5 years), and easy to use and keep in storage. White nonwovens can coordinate crop growth microclimate, especially the relationship among temperature, illumination and transmittance for growing seedlings and vegetables in open field or greenhouse in winter. They can prevent the sun exposure that causes fast water evaporation in seedbed, missing seedlings and the burns of vegetables, flowers and other seedlings.