With the aim of achieving the power balance of “SHENGUANG Ⅱ”, the innovative project of the main array amplifier with the angular variable mirror is studied. The first engineering research results of the new project which were attained on “SHENGUANG Ⅱ” are reported in this paper, including the project design essentials, the outcome of the performance measurement and check in- line, and the result of general energy balance experiment.