Direct Digital frequency Synthesis(DDS) is widely used in the field of telecommunication and electronic equipment, which is the key technique to achieve all-digital equipment. The design and implementation of DDS hardware is completed by adopting Altera DE0-Nano Field Programmable Gate Array(FPGA) core-board combining with high-performance THS5615A Digital to Analog Converter(DAC). The measured results show that，for the frequency range from 0.1 Hz to 7.3 MHz，the frequency accuracy of output signal is better than 0.5%，and the phase shift range is from 0° to 360°，with a phase-shift error within 0.5°，and the phase at any step by 1°. The design bears such advantages as a simple circuit，flexible adjustment of the output waveform, as well as a high performance-price ratio.