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To avoid the shortcomings of traditional all digital phase-locked loop (ADPLL) on circuit parameters adjustment, low lock speed and narrow lock range, a programmable DPLL is proposed. The system design is completed by using electronic design automation(EDA) technology, while simulation and analysis of the DPLL circuit are carried through computer aided technology, and finally, the system is implemented on a FPGA hardware platform. System simulation and hardware test results verify that parameters of the digital filter and controlled oscillator of the system can be adjusted through programming, i.e. changing parameters of the digital filter leads to raising the lock speed, while changing that of the digital oscillator gives rise to broadening the lock range. The phase-locked loop is characteristic of its high lock-speed, wide lock range, simple circuit structure, flexible parameters design, and easy system integration, etc., and also it can be applied to many different areas.