Plastic film coverage is a new technology. Through large-scale promotion and practice, it has been proved that the large-scale production increase, high economic benefits, and wide application range are the few measures for increasing production and income in agricultural production. 1. Characteristics and Variety Selection The most prominent effect of corn mulch film coverage is to increase the temperature and protect the flood, to make up for the lack of temperature, light and water resources. Generally, the accumulated temperature can be increased from 200°C to 400°C to enhance the frost resistance of corn, and the frost-free period is relatively prolonged. Therefore, it is possible to use medium-late-maturing high-product varieties with long growth period and large potential for yield increase. After the film is covered, the corn sowing period is advanced, the birth process is accelerated, early emergence and early maturation. In the selection of species, the plant type with relatively long growth period is more suitable for the selection of varieties that are not susceptible to premature aging and have strong resistance to disease and disease resistance. For example, East Asia 60, Dongdan 8 and Fuyou 1 have shown strong potential for yield increase in the film covering Shiqiao Township, Songyuan City, Jilin Province. Zhang Xianyi, a villager of Jufa Village in Shiqiao Township, was planting Dongdan 60, and the output per hectare was exceeded. 15,000 kilograms. 2. The selected fertilized film-covered corn should be selected from a flat land, deep soil layer, superior middle fertility, good drainage and irrigation conditions, and avoid steep slopes, low-lying land, waterlogged land, thin and thin land, and forest-side land. Saline planting. The mulching corn is afraid of flooding, and the drainage conditions must be taken into account when selecting the land, especially in areas where there is a lot of rain. The mulch corn preparation site should be smooth, meticulous, and free of large pieces of rubbish, which is conducive to emergence. During the site preparation, it mainly focused on water conservation and conservation, that is, autumn tillage and spring tillage. Maize mulching stems and leaves, a large demand for fertilizer, must increase the amount of fertilizer. Scientific practice shows that for every 100 kg of corn produced, 2.5 to 3.0 kg of pure nitrogen, 0.8 to 1.2 kg of phosphorus pentoxide, and 2.1 to 2.5 kg of potassium oxide are required. The ratio of nitrogen, phosphorus and potassium is 2:1:2. Should pay attention to applying base fertilizer, base fertilizer to organic fertilizer, supplemented by chemical fertilizers, high-yielding fields generally apply 4 to 5 cubic meters per 667 square meters of organic fertilizer, phosphorus and potassium fertilizer all at the end of application, zinc deficiency fields should be applied 3 to 5 kg of zinc sulfate; 60% to 70% of total nitrogen fertilizer should be base fertilizer. 3. Timely planting sowing time, the effect of mulching film temperature increase is mainly in the early period, accounting for 80% to 90% of the accumulated temperature in the whole growth period, so the sowing time is 7 to 10 days earlier than the open field corn. According to the actual situation in Songyuan, the majority of farmers adopt the 6:2 or 4:1 rice, wheat and bean intercropping methods to better their advantage of increasing production. Planting density, in terms of Songyuan City, the most suitable density of film-covered corn: 5,300 per 667 square meters of flat-type corn, 6700 compact corn, spacing between 21 to 24 cm. The planting is too dense and it is very easy to cause empty stalks or defertilization at the later stage of the growth and affect the yield. Film selection, mainly considering the thickness and width of the film, the thickness should not be too large, suitable for 0.005 ~ 0.008 mm.