Abstract: Dependency model usually only statically depicts product design dependencies, without considering automatic updates of the model structure. This study begins to propose a design dependency modelling method based on finite state machine, which explicitly represents dependency applicability and dependency pattern to support dynamic modelling of dependencies and multi-level dependency modelling. Then, based on the characteristics of design parameters and dependencies, the corresponding topological hierarchy is defined and an update algorithm of dependency parameters is proposed using topology hierarchy. Supported by dependency pattern derived from intrinsic dependencies, a structure update algorithm is proposed for dependency model. Finally, a robot case is employed for demonstration, which indicates the capability of multi-level dynamic dependency modeling and the maturity of modeling platforms for engineering practices.