As a recent geophysical prospecting technique, microtremor survey technology is economical, environmentally friendly, practical, and widely used in resource exploration and engineering geology. To study the influence of line orientation on the results of a linear array, the microtremor survey results of a multisession double- circular linear array, T- shaped linear array, and linear arrays in different directions were compared and analyzed using the small- scale dense array data measured by the Wuhan Central Seismic Station. The results show that the results of linear arrays in different directions are remarkably different: The measured phase velocity increases gradually with a change in line orientation from north to east, and the results are closest to those of the double- circular linear array at approximately NE45°. The numerical simulation results also show that the results of the linear array are good when the angle between the survey line and the centerline of the main noise source is within a range of 30°-55°, and the measured phase velocity increases gradually with an increase in this angle. When a main noise source is present near the survey area, the measured and simulated results show that an increase in observation time cannot overcome the deficiency of the orientation distribution of the linear array. Therefore, the possible noise source distribution near the survey area should be considered before a microtremor survey.