Identification of subsurface anomalies such as cavities, sinkholes, tunnels, etc. has always been of interest to geotechnical and geophysical engineers due to the possibility of subsidence and possible collapses. Utilizing new methods such as surface wave methods can be considered as a suitable step to identify these anomalies. With the proper use of these methods, a more accurate and clear interpretation of the subsurface structure is obtained. Therefore, in this study, the effect of the heterogeneity of soil is examined in a multi-channel surface wave synthetic data to evaluate of the resolution of the identification of shallow cavities. The results showed that with increasing the percentage of soil heterogeneity, the clarity of the results decreases and it becomes difficult to identify the cavities.