The output characteristics of a multi-wavelength tunable optical param etric oscillator (OPO) which is pumped by an all-solid-state Nd:YVO_4laser w ith the 1064nm wavelength are investigated by quasi-phase- matching period tuning t echnology.The experiment is carried out by using the external cavity structure, singly resonant optical parametric oscillator and continuous wave (CW) operation mode based on the periodically poled MgO:LiNO₃(PPMgLN) crystal.Experimental r esults indicate that the broadly tunable near-infrared spectrum from 1435.9nm to 1670.2nm and the mid-infrared spectru m from 2970.4nm to 4185.0nm are obtained.The ma x imum total signal and idler output power,signal and idler output power at 30.5μm poling period are 4.2W,2.2W and 2W,respectively,corresponding to optical -optical efficiencies of 35.6%,18.6% and 16.9%,respectively.The output power st ability of CW PPMgLN OPO is up to 9.88%.Therefore,a high-power broadly-tunable all-s olid-state CW PPMgLN OPO in the near-infrared and mid-infrared regions is rea lized.