The invention discloses an MAR technology and BIM based engineering display method. The method comprises preparation of an environment and a platform, format conversion of a 3D model, automatic proportion matching, assembling and basic point arrangement of the 3D model, information extraction and application of the 3D model, 3D space detection and indication of a reality scene, interactive controlof the 3D model, arrangement of light material collision of the 3D model in the reality scene, and measurement of the size. The MAR and BIM based engineering display method has the advantages that the MAR technology is applied to large and medium-sized civil engineering, the designed 3D model is placed in the reality scene and watched in the visual angle of humans, so that different interactive operations and information query can be carried out on the model conveniently, different participants the civil engineering are facilitated in understanding a project, a support platform is provided for discussion and negotiation of a civil engineering scheme at any time and place, and the method has significance in development of civil engineering.