The characteristics of a LD pumped Nd:YVO 4 laser operating at 1.34 μm are reported. The maximum output power of 157 mW with a optical to optical conversion efficiency of 30.5% has been obtained at the incident pump power of 515 mW. Variations of the longitudinal modes and the amplitude noise power spectrum with the incident pump power have been studied. The phenomenon that each longitudinal mode has its own relaxation oscillation frequency has been found.