Abstract: The paper describes a CW,non-colling,digital all-solid-stated LD pumped Nd:YVO4 laser driver which adopts microprocessor control,stability power of optics feedback about 10mW output power.The system is composed of stable current source,protection circuit,pulse driver,Si photo-detector amplified and hign-speed microprocessor control system.Based on error variety of nonlinear control curves of LD output laser power by Si photo-detector,we take advantage of window node PID control algorithm to achieve high stability of laser power and reduce error amends.Combining appropriate hardware and software in our driver,we have achieved a variety of protection features including the ability to match and harmonize dynamic state and static state relation to gain LD output power instability to ±3% and internal orexternal pulse width modulation,relay soft and hardwer over-current protection and overvoltage shut-off.A continuously adjustable optical output power with high accuracy and stability has been obtained.