Greenhouse film is all greenhouse material in an important one, greenhouse film performance and life is related to the life of the entire greenhouse and economic benefits, so we must have a certain understanding of greenhouse film performance indicators.

The durability of greenhouse film must be considered. The durability of greenhouse is influenced by the aging resistance function of greenhouse film and the bearing capacity of greenhouse main body layout. Is the durability of the light transmittance in addition to its own strength, the light transmittance will follow the extension of time and continuous attenuation, and the attenuation degree of the light transmittance is the decisive factor affecting the service life of the greenhouse film. Usually steel layout greenhouse service life of more than 15 years.

The light transmittance is a basic objective to evaluate the light transmittance of greenhouse. Light transmittance is the percentage of the amount of light entering the greenhouse versus the amount of light outside. The light transmittance of greenhouse is affected by the light transmittance function of greenhouse film and the shadow ratio of greenhouse skeleton, and the light transmittance of greenhouse is changing at any time with different solar radiation viewpoints in different seasons. The concavity of greenhouse light transmittance becomes the direct influence factor of crop growth and selection of cultivated crops. Usually, the plastic greenhouse is 50%~60%, the light transmittance of glass greenhouse is 60%~70%, and the sunlight greenhouse can reach more than 70%.