A laser diode (LD) end-pumped optical-contact composites Nd:YVO4+KTP three-wavelength laser is reported. The output laser wavelengths are 532,537 and 542 nm respectively. By adjusting the angle of the crystal,1064 nm doubling frequency,1064 and 1084 nm sum-frequency and 1084 nm doubling frequency coexist in KTP crystal. From the impact of nonlinear conversion efficiency on fundamental oscillation,the condition of 1064 nm and 1084 nm dual-wavelength oscillation was discussed and the reasons of three wavelengths power changing with pump power were studied.