The flight time measurement system based on CPLD is developed. Benefiting from the high speed of CPLD ,the precision of laser rangefinder is improved. Furthermore ,the same hardware system can be applied to different kinds of pulsed laser rangefinder through flexibly modifying the design of CPLD. The time measurement system is adapted extraordinarily to high performance portable pulsed laser rangefinder for its compactness ,simple structure ,and high reliability.