A light source system, comprising: a first light source configured to emit first laser; a wavelength conversion device located in an optical path of the first laser and configured to receive the first laser and emit second light, the wavelength conversion device at least comprising three primary color light regions and one mixed color light region; a driver device configured to drive the wavelength conversion device to move in such a manner that respective regions of the wavelength conversion device sequentially and periodically receive the first laser, the three primary color light regions receiving the first laser and emitting light of three primary colors and each of the primary color light regions emitting light of one primary color, and the mixed color light region receiving the first laser and emitting light of a mixed color; a second light source configured to emit supplementary light, the supplementary light being consistent in color with light of one of the three primary colors; and a control device configured to control on and off of the second light source, characterized in that the control device is controlling the second light source to be on in at least two of: every time period during which a primary color light region of a same color is receiving the first laser, every time period during which the mixed color light region is receiving the first laser, and some time periods during which a primary color light region of a different color is receiving the first laser, the primary color light region of the same color being one of the three primary color light regions that emits light of a primary color same as that of the supplementary light, the primary color light region of the different color being one of the three primary color light regions that emits light of a primary color different from that of the supplementary light. a first light source configured to emit first laser; a wavelength conversion device located in an optical path of the first laser and configured to receive the first laser and emit second light, the wavelength conversion device at least comprising three primary color light regions and one mixed color light region; a driver device configured to drive the wavelength conversion device to move in such a manner that respective regions of the wavelength conversion device sequentially and periodically receive the first laser, the three primary color light regions receiving the first laser and emitting light of three primary colors and each of the primary color light regions emitting light of one primary color, and the mixed color light region receiving the first laser and emitting light of a mixed color; a second light source configured to emit supplementary light, the supplementary light being consistent in color with light of one of the three primary colors; and a control device configured to control on and off of the second light source, characterized in that the control device is controlling the second light source to be on in at least two of: every time period during which a primary color light region of a same color is receiving the first laser, every time period during which the mixed color light region is receiving the first laser, and some time periods during which a primary color light region of a different color is receiving the first laser, the primary color light region of the same color being one of the three primary color light regions that emits light of a primary color same as that of the supplementary light, the primary color light region of the different color being one of the three primary color light regions that emits light of a primary color different from that of the supplementary light. <EOS>