The present invention provides a drawing retrieval method and system. The method is characterized in that: by determining a key part of the construction in the three-dimensional model of the construction project, the technicians of the construction unit and the designers of the design unit can be coordinated, and uncertainty of the key parts of the construction in the 2D drawing can be found as much as possible before the construction; and the 2D detail drawing of the key parts of the construction and the corresponding 3D detail models are generated according to the construction parameters, and the association relationship between the 3D image and the 2D image is established, so that the accuracy of the expression of the construction design can be improved, the degree of control of the complex nodes by the technicians on site can be improved, the calibration ability of the construction design can be improved, workers can view the drawings in a facilitated manner, the understanding canbe improved, accuracy of understanding of the construction workers on the construction plan of the construction project can be improved, the accuracy of the operation can be increased, the re-work isreduced, project quality and corporate profits can be ensured, and convenient conditions are created for acceptance of concealed construction projects.