Classification:

1. Polyethylene (PE) film: relatively low price, good flexibility and light transmittance.

2. Polyvinyl chloride (PVC) film: good thermal insulation performance, but the light transmittance is slightly lower than PE film.

3. Ethylene-vinyl acetate copolymer (EVA) film: excellent comprehensive performance, with high light transmittance and thermal insulation performance.

Advantages:

1. Increase crop yield: provide good growth conditions for crops and increase yield.

2. Regulate the growth cycle: by controlling the environment in the greenhouse, the time to market of crops can be advanced or delayed to improve economic benefits.

3. Resist natural disasters: provide protection for crops under severe weather conditions, such as cold waves, heavy rains, etc.