The invention discloses a method for realizing an assembled electric power application software based on a QML technology. The method mainly comprises the following steps: achieving dynamic expansion of attributes of the described power equipment; and associating a specific function expansion module with the expanded attributes of the power equipment, so that the attributes of the power equipment in the software can be dynamically expanded, the attributes of the power equipment are associated with a new functional module to ensure that the software is associated with the newly-added functional module, and thus the effect of expanding functions without changing a source program can be achieved, and the operation of the power equipment can be more stable.