In this paper, an autoregressive model (AR model) is used to simulate the wind speed time series. The spectrum of the simulated wind speed time series is found in agreement with the target spectrum, i.e., Davenport wind speed spectrum. The relationship between the wind load and the wind speed is derived according to the related Chinese codes. Samples of the fluctuating wind load on the nodes of a structure are obtained. Simulations with the Finite Element Method (FEM) are carried out for a 42m-high communication tower. The tower is made of Q235 steel. ANSYS software is used to build the FEM model. 188 elements of beams are applied for the main members of the tower structure, while link elements are applied for the web members. The wind load time history series are simulated by using Matlab software and are used as the input loads. The modal analysis shows that the first several modes of the structure are all plane vibration modes, and after the 3rd mode one may find torsional vibration modes and local vibration modes. Meanwhile, the time history analysis is used to determine the structural responses under wind loads. Results show that, under fluctuation wind loads, the horizontal displacement is much smaller than the value suggested by the code for the design of high-rising structures. However, it should be noted that the transmission tower experiences a large stressing in the chords where the section of the tower changes.