A new continue wave laser diode driver,which integrates FPGA technique, with high quality single-chip microcomputer (SCM) HD64F7045 as the controlling center is presented. In the LD controller module, the use of negative feedback technique could stabilize the drive current (IF), the optical output power (Po) and the forward voltage (VF) respectively with high stability.The complete laser diode protection is provided by means of independent current limit and power limit settings, output off shorting circuits, and a slow turn on sequence. In the temperature controller module, the temperature could be controlled precisely with PI control method and the thought of integral separation. Results show that forward current stability can attain 10-4 degree, and temperature stability can attain ±0.01 ℃.