The present invention relates to a system and method of utilizing a reinforcing bar classification code for effective use of BIM, comprising: a BIM shape modeling step (step S10) of modeling a BIM shape with a shape modeling means (10); A reinforcing bar detail definition step (step S20) of defining reinforcing bar details with a reinforcing bar library template modeling means 20; A surface setting step (step S30) that is a standard for setting a surface that is a standard cover thickness of the shape with the part automatic generation and placement program execution means 30 and corresponding to the rebar classification code A template model applying step of applying a template model (step S40); 3D reinforcing bar modeling generation step (S50 step) of defining Excel data with 3D reinforcing bar model means 40 and generating single or multiple 3D reinforcing bar models; Material table data extraction step (step S60) of extracting model-based material table data by means of the reinforcing bar information extraction program means 50; It consists of a 2D/3D material table generation step (S70 step) that generates a 2D/3D material table with the material table generation means 60, and classifies it by type of reinforcing bar such as open type or closed type, as well as classification according to bending patterns. All information on reinforcing bars, including reinforcement information according to classification, is provided from the design stage to the manufacturing and construction as well as the maintenance stage, eliminating errors (information omission, incorrect construction, etc.) that may occur due to information disconnection and maintenance. It is possible to do economically, and is linked to a pre-built library and intuitively usable classification code, which minimizes deviations by workers, improves productivity and secures continuity of information, as well as adjacent rebars when rebars are placed. It is a useful invention that has a special advantage of securing an arrangement space and eliminating mutual interference between rebars in reinforcing reinforcement since it can effectively secure information about
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