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Aiming at the problems of low single industrial benefit, serious shortage of water resources and low utilization rate of water resources in Hongsipu District of Wuzhong City, taking drip irrigation of millet under plastic film as the research object, the change laws of leaf area conversion factor and leaf area index（LAI） of millet under drip irrigation under plastic milk in different growth periods were studied by using the data in 2022. The results showed that the leaf area conversion factor of millet in four growth stages were 1.42, 1.50, 1.53 and 1.50 respectively. After verification, R² were 0.997, 0.991, 0.986 and 0.990 respectively, and Nash efficient coefficient were 0.992, 0.989, 0.979 and 0.984 respectively. The simulation results of leaf area conversion factor were good. The leaf area index in the whole test area in different periods showed the variation laws of gradual growth and the growth rate gradually decreased. The leaf area index in the grain-filling maturity stage was 6.96. The leaf area index under different test treatments showed the variation of increase. The leaf area index under J90, Q110, B110, J110, B130, J130 and B150 treatments showed a negative increasing trend in the late growth period. The leaf area index in filling and mature stage under B110, B130, B150 treatments was reasonable. Under the high-yield irrigation system, the average grain yield first decreased and then increased as the leaf area index increased. The above results provided some reference basis for the leaf area measurement and the related study with the leaf area index and yield. [ABSTRACT FROM AUTHOR]

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