The construction of wake flow field model is significant for the study of flight dynamics in case of wake. By combining the divergent characteristics of the long distance wake and sinusoidal perturbation charactoristic the long wave oscillation model of the wake is contructed. Velocity parameters of wake flow field with different amplitude parameters are analyzed, and the grid adsorption method is proposed to solve the irregular problem arrayed after coordinate transformation. Compared with other dimensional interpolation algorithms, validation results show that the interpolation of grid adsorption method is fastest when the punctuation density reaches the inflection point, and the precision meet the requirements, causing the highest efficiency. In the end, the irregular wake field of the front plane is constructed.