In order to find out the near-field radiation characteristics of phased arrays, the near field mathematical model for triangular grid arrays is established according to the beam forming principle. The simulation is carried out to verify the model. It shows that the calculation is in good agreement with the simulation because the maximum deviation for the near field intensity from phased arrays is about 1dB on the main beam. Then the model is used to analyze the near field distribution characteristics of phased array. In the region where the main beam is not formed in the near field, the beam shape has a few peaks and troughs. The transmission direction hovers near the direction pointing to each observation point when the field intensity on the normal line in the region reaches maximum value. The peaks and troughs converge and the beam width gradually narrows as the distance increasing. Also the hovering ranges of the transmission direction decreases slowly and finally it is consistent with the actual beam direction after the main beam is formed. The conclusion is also available for the rectangular grid phased arrays. The research provides a theoretical basis and guidance for electromagnetic compatibility design of systems and radiation near-field measurement for phased arrays.