In order to obtain picoseconds pulse output, a Nd∶YAG laser passively mode-locked was proposed by a reflective semiconductor saturable-absorber mirror. Based on Z-type resonator, the laser output was obtained with repetition frequency of 101 MHz, pulses of 23.4 ps, central wavelength of 1 064 nm and average power of 356 mW, corresponding to 3.49 nJ pulse energy. The measured beam quality is about 1.2. In order to enhance the average single pulse energy of mode-locked pulse, Q-switched mode-locking operation was obtained by inserting an acousto-optic Q-switch, producing 364 mW pulses with 1.03 MHz repetition rate. The resulting 406 nJ pulse energy is 116 times larger than that from continuous mode-locking operation.