The invention discloses a lightweight three-dimensional
assembly instruction generation method for a complex product, and the method specifically comprises the steps: 1, constructing a position-attitude matrix of a part, enabling the moving process of the part to form an
assembly path corresponding to the part, enabling the
assembly path to be dispersed into a plurality of points, enabling each point to be mapped to a
key frame, and enabling the
key frame to be a
key frame; calculating motion resources of the current key frame and the previous key frame, associating the motion resources to the current frame, and recording a
timestamp of the current frame; 2, generating a
simulation control instruction; 3, establishing a model hierarchical
management structure which comprises an entity layer, an
annotation layer and an
application layer, and associating the
annotation layer with the assembly process; and step 4, integrating the assembly path, the
annotation layer display logic and the
simulation control script, and generating a lightweight three-dimensional assembly guidance file. According to the invention, the efficiency and quality of the assembly process can be obviously improved, and the high-standard requirement of the modern manufacturing industry is met.