Summary: Taking into account the direction of arrival (DOA) of wideband signals for conformal array antenna, a joint DOA and polarization estimation algorithm was proposed. First, the narrow sub-band was acquired by using the short time Fourier transformation (STFT). Then, two sets of snapshots which satisfied rotation invariance were constructed via time-delayed signal. So the array steering matrices corresponding respectively to different narrow sub-bands were estimated. Furthermore, making use of the frequency difference of different narrow sub-bands, the 2D DOA and polarization estimation were acquired jointly. The proposed method can be applied to arbitrary conformal array structure without parameter matching and searching process. The algorithm can also reduce the computational complexity considerably and can efficiently improve the practical engineering value. Monte-Carlo simulation demonstrates the good performance and the effectiveness of the proposed method.