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We present a high-efficiency 532nm green light conversion from an exteal cavity-enhanced second harmonic generation (SHG) with a periodically poled KTP crystal (PPKTP).The cavity is a bow-tie ring configuration with a unitized structure.When the impedance matching is optimized,the coupling efficiency of the fundamental is as high as 95％.Taking into account both the high power output of the second harmonic and the stability of the system,we obtain over 500mW green passing through the output cavity mirror,corresponding to a net conversion efficiency higher than 75.2％.Under these operating conditions,the power stability is better than ±0.25％ during 5 h.It is the highest conversion efficiency and power stability ever produced in the bow-tie ring cavity with PPKTP for 532nm generation.