A light source system , comprising: a first light source comprising a first blue laser light source configured to emit first blue laser light, a red laser light source configured to emit red laser light, and a green laser light source configured to emit green laser light; a second light source comprising a second blue laser light source ; a wavelength conversion element configured to convert second blue laser light emitted by the second blue laser light source into excited light; and characterized by a controller configured to control to turn on or off the first blue laser light source , the red laser light source , the green laser light source and the second blue laser light source in a first mode or a second mode, in such a manner that, in the second mode, the controller turns on the first blue laser light source , the red laser light source , and the green laser light source , such that the first blue light, the red laser light and the green laser light are combined to form light source light and turns off the second blue laser light source , and in the first mode, the controller turns on the first blue laser light source and the second blue laser light source , such that the first blue light and the excited light are combined to form the light source light, and turns off the red laser light source and the green laser light source ; wherein the wavelength conversion element is provided with a wavelength conversion material, the wavelength conversion material being yellow phosphor, a combination of yellow phosphor and red phosphor, a combination of yellow phosphor and green phosphor, or a combination of red phosphor and green phosphor; wherein the light source light provides color coordinates in three primary colors of red, green and blue, and provides a first color gamut in the first mode, a second color gamut in the second mode; wherein the first color gamut is located within the second color gamut. a first light source comprising a first blue laser light source configured to emit first blue laser light, a red laser light source configured to emit red laser light, and a green laser light source configured to emit green laser light; a second light source comprising a second blue laser light source ; a wavelength conversion element configured to convert second blue laser light emitted by the second blue laser light source into excited light; and characterized by a controller configured to control to turn on or off the first blue laser light source , the red laser light source , the green laser light source and the second blue laser light source in a first mode or a second mode, in such a manner that, in the second mode, the controller turns on the first blue laser light source , the red laser light source , and the green laser light source , such that the first blue light, the red laser light and the green laser light are combined to form light source light and turns off the second blue laser light source , and in the first mode, the controller turns on the first blue laser light source and the second blue laser light source , such that the first blue light and the excited light are combined to form the light source light, and turns off the red laser light source and the green laser light source ; wherein the wavelength conversion element is provided with a wavelength conversion material, the wavelength conversion material being yellow phosphor, a combination of yellow phosphor and red phosphor, a combination of yellow phosphor and green phosphor, or a combination of red phosphor and green phosphor; wherein the light source light provides color coordinates in three primary colors of red, green and blue, and provides a first color gamut in the first mode, a second color gamut in the second mode; wherein the first color gamut is located within the second color gamut. <EOS>