We propose a new ptychographical imaging algorithm based on illuminating beam cooperating with rotational phase encoding. Compared with the traditional ptychographical imaging, the proposed algorithm has a diffractive wave front that is encoded with the uniform phase modulator in a block. It leads to the faster convergent speed for the iterative algorithm of the ptychographical imaging. The illuminating method can present fantastic robustness to resist bad influences brought by the noise and transverse shift of probes. Compared with the random phase modulator, the rotated phase modulator introduced into our algorithm is convenient to be fabricated and located into the real configuration. Therefore, the proposed algorithm has a good value in practical applications such as real-time microscopy and superresolution imaging.