Abstract: In order to clearly quantify and evaluate the complex issues in the interior design of self-driving car, and improve design efficiency, extension is applied to the interior design of self-driving car, and the definition of interior design problems proposed for self-driving car methods, conjugate analysis, generating algorithm and constructing an evaluation index system for the interior design of unmanned vehicles. Taking the self-driving car interior design based on the 2030 90s parents, children and pet dogs traveling together in the suburbs as an example, through the self-driving car interior design scheme generation algorithm based on the extension theory, three effective designs of creativity are first obtained, and the designs expressed to make them concrete into a design plan, and a goodness evaluation finally performed to obtain the optimal plan. The design results verify the feasibility and effectiveness of the method.