An all solid-state doubling frequency continuous-wave green laser at 542.7 nm is reported. By using a three-mirror folded cavity resonator and pumping the Nd:YVO4 crystal whose doping Nd3+ concentration is 0.2% (atom fraction) with a 20 W output power laser diode (LD),a green laser at 542.7 nm is obtained by reasonably chosing a 10 mm long type II critical phase matching RbTi OPO4 (RTP) crystal to intra-cavity doubling frequency. When the incedent pump power is 19 W,the maximal output power is 2.4 W,the optical-optical conversion efficiency is up to 13%,the power stability in half an hour is better than ±2.8%,and the M2 factor is 1.22.