A self-adaptive laser based on a diode bar side pumped Nd:YVO4 slab with opened-loop reciprocal cavity completed by dynamic holographic gratings is created. The output power, optical-to-optical efficiency, frequency spectrum and spatial characteristics of the generated beam are examined. Compared with similar structure of traditional laser oscillator, the holographic gratings are exist in the opened-loop reciprocal cavity and the obvious modulation of the transverse mode and longitudinal mode is observed. A high spatial quality beam (M2<1.2) with up to 18.25 W average power, 48% optical-to-optical efficiency, and 10001 extinction ratio is obtained.