Using a laser diode end pumped Nd∶YAG crystal,LBO nonlinear crystal intracavity frequency doubling,birefringent filter(BF)frequency-selecting,a stable 561 nm laser output with low noise is obtained.The size of LBO crystal is 2 mm×2 mm×10 mm,and the crystal is cut with type Ⅰphase matching.The 561 nm laser maximum output power with low noise is 70 mW when the pump power is 4.8 W,and the optical to optical conversion efficiency is 1.4%.As a contrast,using frequency-selecting with BP,the obtained noise of 561 nm laser is higher than that by BF.The experimental results and theoretical analysis are consistent.