Method and system for automatically drawing broadside ribs

The invention discloses a method and a system for automatically drawing broadside ribs based on CAD (Computer Aided Design) drawing, which are characterized in that an AutoLISP language in AutoCAD software is adopted to secondarily develop a functional module for automatically drawing a bulk cargo ship broadside rib structure; the method comprises the following steps: selecting reference lines of a top side cabin inclined plate, a side outer plate and a bottom side cabin inclined plate, inputting parameters required by side ribs, automatically calculating a side rib shape point column according to a setting judgment function module, calling a drawing program unit, automatically setting a layer, completing automatic drawing of the side ribs, grouping, and automatically adjusting a linetype proportion. According to the method, the bulk cargo ship broadside rib structure is automatically drawn through the computer, manual participation is reduced, and therefore the method has very important significance for ship