Electric power science and technology is a set of system aimed at power products and markets. For electric power enterprises, reasonable layout and maximum benefits of R&D investment are core principles and goals of building an advanced technology system. Optimal allocation of resources through scientific and technological planning and control mechanisms is a key to maximizing quantity, quality, and benefits of scientific and technological achievements. To ensure scientific and continuous cultivation of electric power scientific and technology, based on the theory of technology life cycle and its assessment methodology such as TRL, combining with the concept and cultivation system research, this paper divides the cultivation cycle of scientific and technological achievements in four stages, respectively technology survey stage, technology research stage, product development stage and product market stage. Meanwhile, the technology life-cycle theory is adopted to describe external environment of enterprises. With the internal and external double-cycle theory model and related cycle evaluation methods, the concept of technology domain for major scientific and technological achievements of electric power enterprises is introduced. The methodology of supporting precise positioning and strategy formulation towards cultivation of major scientific and technological achievements thorough construction of a dynamic technology domain map is proposed.