Fuente: Wipo "digitalization" The invention relates to a modularizing design method for a circuit system. The design method for simplifying a complex circuit is realized by designing the original complex multilayer PCB (Printed circuit board) circuit into an independent function unit module, installing the independent function unit module on a relatively simple double-side board or single-side board and connecting with an external circuit of the module by few interfaces. The circuit system adopts the modularizing design method, the unit module has generality and portability and can be directly applied to other products with same function, the design cost of the complex circuit of the electronic product is reduced, and the development cycle of the congeneric product is effectively shortened.