A parameter blind estimation method of Frequency-Hopping(FH) signals is proposed based on morphological filtering and the combination of time-frequency distribution(TFD), to solve the problems of large computation amount and the decreased time-frequency resolution. Short-Time Fourier Transform (STFT) and Wigner-Ville Distribution(WVD) are adopted to obtain the combination of TFD. Thereafter, the clear time-frequency image is obtained by morphological filtering. According to the time-frequency image, the hop duration, hop timing and hop frequency are estimated. The theoretical analysis and simulation results demonstrate that the proposed algorithm, compared with Smoothed Pseudo Wigner-Ville Distribution(SPWVD), bears less amount of calculation and higher estimation precision.