Method and device for generating assembly dimensional chain

The invention provides a method and device for generating an assembly dimensional chain. The method comprises the steps that dimension and tolerance information and assembly constraint information of a pre-constructed three-dimensional assembly model are acquired; a dimension and tolerance information list is acquired according to the dimension and tolerance information, and the dimension and tolerance information list comprises a dimension and tolerance type with a first incidence relation, dimension and tolerance data and information of two first correlation geometrical characteristics corresponding to the dimension and tolerance data; according to the assembly constraint information, an assembly constraint information list is acquired, the assembly constraint information list comprises an assembly constraint type with a second incidence relation, assembly constraint data and information of two second correlation geometrical characteristics corresponding to the assembly constraint data; an assembly relation