This paper shows an external integrated ring cavity used to generate 461 nm blue radiation,which was locked by three different methods,Hansch-Couillaud,Pound-Drever-Hall,and intramodulation. And the factors the length of crystal and waist of fundamental light in crystal that affected the stability of output,were studied. The experimental results show that the integrated cavity improves the stability of output of 461 nm. And it reaches 3%,including 2% instability of fundamental. Because of absorption of 461 nm,long crystal,small waist and its disposition could impact their power and stability. And the output of second harmonic generation reaches 310 mW,54.8% of the conversion efficiency,and 71.3% of the net conversion efficiency. The reflection ratio of coupling mirror was discussed in addition.