Eesearch on automatic tuning picosecond parametric laser is reported. Using one couple of MgO:LiNbO3 for angle tuning, equiped with automatic wavelength scanning system, a picosecond tunable output ranging from 0.7～2.2μm is obtained. The temporal and spectral characteristics of the parametric pulse are discussed. Analysis fits well with the experimental results. Single pulse width of <30 ps and band width of ～1nm have been achieved over 1MW in peak power. The maximum overall conversion efficiency of energy is 5.4%.