The invention discloses an installation construction method for carrying out component optimization by software. The method comprises the following steps of: (1) through a modeling module of BIM (Building Information Modeling) software, carrying out modeling on the main structure and the outer eaves of a building, and separating the GRC (Glass-fiber Reinforced Composite) component of the outer eaves from the main structure of the building; (2) importing the main structure, which finishes modeling, of the building and the component into an analog module, and carrying out construction analog and optimization design until installation requirements can be met; (3) carrying out corresponding revision on the component of the outer eaves; (4) carrying out size marking on the component, and outputting a three-dimensional model planar graph of the component; (5) according to the planar graph, prefabricating the component; (6) importing the optimized component model into the analog module, calling a construction hanging basket model in the BIM database, and selecting the force bearing point of the construction hanging basket; and (7) in the analog module, adopting the hanging basket of which the force bearing point is determined to carry out component analog construction, and carrying out site construction if construction requirements are met. When the method is adopted for carrying out construction analog, problems in a construction process can be precontrolled as far as possible.