Abstract: With the proposal and development of urban low-altitude economy, there are higher demands for refined modeling and simulation of urban wireless communication channels. Especially in application scenarios such as drones, the impact of urban forest environment on radio wave propagation cannot be ignored. This paper first proposes a refined modeling method for trees, which can more accurately describe the characteristics of trees compared to traditional approximate tree modeling methods. Secondly, a vectorized moving window finite-difference time-domain(MW-FDTD) method is introduced, which improves the computational efficiency of forest radio wave propagation problems. Finally, two typical urban vegetation environments are measured for electromagnetic wave propagation in forests, and the measurement data is compared with the numerical simulation results. The comparison results show that the vectorized MW-FDTD has higher computational efficiency than the traditional MW-FDTD. The experimental results show that the root mean square error between the simulation results of the fine model of trees and the measured data is smaller.