Abstract: Abstract: Plastic ?lm mulching is widely accepted to be an important technology for agricultural production that improves crop yield and changes production methods in low water input regions in China. However, the abuse and widespread use of plastic film mulch technology have aggravated a series of residual plastic pollution in farmland. Therefore, it is of great significance to conduct the suitability of plastic film mulch technology for the comprehensive prevention and control of the residual pollution of mulching. In this paper, we proposed a concept of suitability of plastic film mulch for crops and its estimation method. The suitability of plastic film mulch for crops means plastic film mulch technology compensates the difference between the crop environmental elements and the local location, and it is the basic basis for the macro-decision of the application of plastic film covering technology and the comprehensive prevention and control of plastic film residual pollution. Based on the function of plastic film mulching, and concept of suitability of plastic film mulch for crops, a method for evaluating the suitability of plastic mulching for crops was constructed. We can collect the plastic film mulching function data by the means of retrieval field experiment, to clarify the relationship between crop mulching and soil temperature, water and economic yield, and to quantify the function of increasing soil temperature and crops yield, reducing soil water evaporation of plastic mulching. The mathematical models of soil temperature (soil moisture content), bare soil temperature (soil moisture content), yield and accumulated temperature ≥10 ℃ at different growth stages of spring maize in Northeast China reached extremely significant levels (P < 0.01). Quantifying the influence of plastic film mulching on increasing temperature, retaining water and increasing yield laid a foundation for the establishment of a suitable evaluation system for plastic film mulching. According to the technology of plastic film mulching on the spot investigation, the key indexes of ecological suitability and economic suitability were screened out based on the expert consultation, which were Crop Temperature Deficit Index (CTDI), Crop Water Deficit Index (CWDI), Economic Benefits Increment (EBI) and Input-Output Ratio (IOR), respectively. An evaluation model for the suitability of mulching technology was constructed. Meanwhile, we calculated the suitability index, to clarify the planting scope of spring maize with different mature types under plastic film mulching in Northeast China, and to form the appropriate regionalization of plastic mulching of crops according to the standard of crops demand and economic benefit. The suitability area of plastic film mulching was divided into highly suitable area, moderately suitable area and unsuitable area. The use of plastic film should be increased in highly suitable area, the plastic film mulching should be adopted scientifically in the moderately suitable area according to the local ecological environment, economic benefit and actual demand, and decreased or avoided completely in the unsuitable area. The research on the suitability of plastic mulching for crops can provide reliable technical support for the rational utilization of crop plastic mulch technology, the zero increase of plastic film input and the comprehensive prevention and control of plastic film pollution in China.