Abstract: 【Objective】To clarify the dynamic development characteristics of filament extension and fresh weight of maize inbred lines in different ecological regions,which could provide new theoretical basis for predicting the growth dynamics of maize inbred lines using simulation models. 【Method】Field experiments were conducted in different ecological regions of Henan and Hainan from 2024 to 2025,using maize inbred lines PH6WC,ZM3358,HT7401 and HB8709 as experimental materials. A Logistic dynamic growth model for maize inbred line filament extension and fresh weight development was constructed based on growth days. The model characteristic parameters were used to analyze the growth characteristics of maize inbred line filament extension and fresh weight,and the accuracy and precision of the model were tested through field measured values. 【Result】The filaments of maize inbred lines in different ecological regions showed a linear sharp extension from the 1^st to 3^rd d,with rapid and continuous extension during 3-7 d in the Henan ecological region and during 3-9 d in the Hainan ecological region. The filament extension in the Henan and Hainan ecological regions lasted for 8-10 d and 11-13 d respectively. The filament fresh weight of maize inbred lines grew slowly in the early stage,rapidly increased in the middle stage,and steadily increased in the later stage,showed an S-shaped unidirectional increasing trend. The determination coefficient R² of the Logistic simulation model for the filament extension and fresh weight growth of maize inbred lines in different ecological regions exceed 0.9600,and the probabilities were all below 0.0001,reaching an extremely significant level. The correlation coefficient between the measured values and the simulated values approached 1.0000,and the measured values were very close to the simulated curve and evenly distributed on both sides. The simulated curves were highly consistent with the measured values,and the Logistic equations had characteristic parameters such as practical biological significance under the environmental conditions of this study. There were obvious differences in growing days required to achieve maximum growth rate,filament growth at the maximun growth rate, maximum growth rate,and average growth rate in the Logistic model of maize inbred lines with filament extension and fresh weight in different ecological regions. 【Conclusion】There are obvious difference in the growth dynamics of filament extension and fresh weight of maize inbred lines in different ecological regions of Henan and Hainan. The logistic model has excellent simulation effects in different ecological regions,with good predictability and interpretability. It can accurately simulate the dynamic development process of maize inbred line filament extension and fresh weight.