Embodiments of this application provide a user interface UI interface adaptation constraint solving method and a related apparatus. In the method, a plurality of constraint relationships in a UI interface are identified and grouped into two types, a constraint relationship of a first type is solved in an integrated development environment IDE, and a constraint relationship of a second type is a constraint relationship solved in a terminal or the IDE. The plurality of constraint relationships are used to determine a layout of one or more components in the UI interface. The IDE calculates a first intermediate solution set based on the constraint relationship of the first type in the plurality of constraint relationships. The first intermediate solution set is used to determine the layout of the one or more components in the UI interface together with the constraint relationship of the second type. According to embodiments of this application, UI interface rendering efficiency of the terminal can be improved.