On the basis of the characteristics of the vector architectural drawings，extracts feature informations of blocks with unattached semantics, adjacent pairs of parallel lines and closed contour lines for identification. Then，achieves 3D architectural reconstruction through interactive stretching the recognized vector data set and editing the parameterized model database. Finally，aiming at study of the safety of public facilities, designs and generates scene semantic documents applicable to fire simulation and the personnel evacuation simulation. The experiment results show that the method achieves high speed and accuracy in 3D reconstruction of architectural drawings and the generated semantic documents meet the research requirements of the safety of general public facilities.