A laser diode array pumped Nd∶YAG laser that generates simultaneous laser action at wavelength 1064 nm and 1319 nm was reported.Nonlinear optical crystal KTP was used as intracavity sum frequency crystal.Using type Ⅱ critical phase-match,a yellow laser at 589 nm was obtained by 1064 nm and 1319 nm intracavity sum-frequency mixing.With an incident pump laser of 12 W,the maximum output power of 430 mW was obtained.The optical-to-optical conversion was up to 3.6%.The M~2 beam quality factor of the sum-frequency mixed yellow laser was less than 1.2.Experimental results show that the intracavity sum-frequency mixing is an effective method for obtaining 589 nm laser.Also it can be applied to other transition wavelengths in other laser crystals to obtain more all-solid-state lasers with different wavelengths.