After reasonably long-term scientific efforts, the time is coming for steady-state burning plasma in the operation of the ITER, and complementary research on other large-scale devices. For fusion energy reactors, however, the realization of steady-state burning plasma is not a goal for fusion technology development. Rather, we finally initiated fusion technology development aimed at establishing a steady-state burning system and steady-state fuel supply. This paper discusses strategies for these two issues, based on history and present knowledge.