Thanks to the advantages of large bandwidth,flexible tunability,and immunity to electromagnetic interference (EMI),photonic generation of microwave waveforms h as been a hot research topic in recent years.In this paper,a triangular waveform generation scheme based on a dual-electrode Mach-Zehnder modulator (DE-MZM) and tunable dispersion compens ator (TDC) is proposed and experimentally verified.A continuous-wave (CW) light wave is modu lated by a local oscillator (LO) signal through a DE-MZM to generate all the order sidebands .By properly tuning the direct current (DC) bias of the modulator and introducing phase shifts on optical signa ls through the TDC,a triangular waveform with a repetition rate equal to that of the LO signal will b e generated after photodetection. In addition,by simply adjusting the frequency of the LO signal,the repetition rate of the generated triangular waveform can be also changed,which features the advantages of good f requency tunability.In the experiment,triangular waveforms with the repetition rates of 5GHz and 6GHz are successfully generated. The proposed scheme has simple structure and tunable repetition rate.Usi ng commercially available photoelectric devices,the repetition rate can be further improved to 40GHz,and may meet the requirements for future high-frequency electronic systems.