The invention discloses a control circuit of a light-dimming assembled lamp, which can give full play to the energy-saving characteristic of an energy saving lamp and the light-dimming characteristic of an electric incandescent lamp. The control circuit comprises an electric incandescent lamp light source (G9), a CFL light source (5), a central controller (IC1), a central controller power supply circuit (1), a phase angle detection signal and CFL output flicker detection signal circuit (2), an electric incandescent lamp switch control circuit (3), a CFL switch control circuit (4); wherein the phase angle detection signal and CFL output flicker detection signal circuit (2) inputs phase angle signals and CFL output flicker signals to the central controller (IC1), when output phase is reduced to preset value or CFL output light flickers, the central controller (IC1) turns on the electric incandescent lamp light source (G9) through the electric incandescent lamp switch control circuit (3) and turns off the electric incandescent lamp light source (G9) through the CFL switch control circuit (4); when output phase is increased to the preset value or turns full phase output, the central controller (IC1) turns off the electric incandescent lamp light source (G9) and turns on the CFL light source (5).The control circuit of the invention can be applied to the field of light source drive.