Let students understand the principle of fish and vegetable symbiosis and understand the elements needed for the ecological cycle and growing environment. Began to build a fish-vegetative symbiosis system. Before the class, relevant materials will be prepared in advance, and then how to set up various parts of the system will be taught, while explaining its scientific principles, such as siphon devices. Advanced students can learn to write automated programs with basic electronic devices. Let students understand Micro:bit, from assembly skills on hardware to programming knowledge on software.