Main hardware and software of the system are designed, using microcontroller as the core controller, and combining with D/A conversion, LCD1602 display, programmable amplifier designed output frequency, amplitude adjustable sine, square and triangular wave signal generator. The experiment shows that the system implements wave generation, display, and adjustment of signal frequency and amplitude. The frequency and amplitude errors are less than 5%, and wave quality is good. This system has the advantages of simple circuit, small size, low cost, high precision, stable work and easy usage, having a wide range of application.