The Nd:YAG slab laser with laser diode array end-pumping experiment has been developed. According to the characteristic of slab medium, the slab laser with image-inverting resonator (IIR) avoids effectively the beam excursion to the slab end and the instability on laser power. It obtains the quasi-continuous laser output with the average power higher than 1000 W when the pump power is 3330 W, the slope efficiency is 42.2%, the stability of the output power is better than 1.5%. The beam quality of laser is measured and the relevant academic analysis is done.