本文给出一种基于FPGA的新型谐波检测系统的设计方案。在该方案中，采用FPGA实现快速的FFT运算，采用数字锁相环来同步被测信号，以减小由非同步采样所产生的误差并给出实现的设计实现。数字锁相环和FFT算法用VHDL语言设计实现，该方案能提高谐波分析的精度以及响应速度,同时大大地精简了硬件电路, 系统升级非常方便。-This paper presents a new FPGA-based harmonic detection system design. In the scheme, using the FFT for fast FPGA computing, digital phase-locked loop to synchronize the measured signal to reduce the non-synchronous sampling error arising from implementation of the design and implementation are given. Digital PLL and FFT algorithm design and implementation using VHDL language, the program can improve the accuracy of harmonic analysis and response speed, and greatly streamline the hardware circuit, the system is very easy to upgrade.