The widespread application of microcontroller technology in the field of electronic engineering has become increasingly prominent. One significant application is the control circuit design in fountain systems. This paper delves into the design and simulation of a fountain control circuit based on a microcontroller. To begin, we introduce the fundamental principles and applications of microcontroller technology in control systems, providing readers with essential background knowledge. Subsequently, we elaborate on the design process of the fountain control circuit, covering the selection of circuit components, connection methods, and optimization of control algorithms. Through simulation experiments, we validate the feasibility of the design and assess the system's performance. Finally, we discuss potential issues and solutions encountered in the design, along with future directions for further optimization. This graduation thesis serves as a valuable reference for the application of microcontrollers in fountain control.