A light source system comprising a laser light source, a transflective optical component, a set of first lenses, a scattering surface, a set of second lenses, an excited light generator, a relay lens, an aperture, and a lens; the laser light source is configured to emit light in a first wavelength range; the transflective optical component is located in an optical path of the light in the first wavelength range, is configured to reflect a part of the light in the first wavelength range to form first light, and is configured to transmit a part of the light in the first wavelength range to form second light; the set of first lenses and the scattering surface are disposed in an optical path of the first light, the first light is guided by the set of first lenses to the scattering surface to form scattered light, and the scattered light is emitted to the set of first lenses and returns to the transflective optical component after being guided by the set of first lenses; the set of second lenses and the excited light generator are disposed in an optical path of the second light, the second light is guided by the set of second lenses to the excited light generator, which generates light in a second wavelength range under excitation, and the light in the second wavelength range is emitted to the set of second lenses and returns to the transflective optical component after being guided by the set of second lenses; the scattered light after being transmitted by the transflective optical component and the light in the second wavelength range after being reflected by the transflective optical component converge into a beam of output light, and the output light is sequentially light-shaped by the relay lens, beam-adjusted by the aperture and emitted by the lens onto a far-field screen to form a desired light spot; and the set of first lenses is movable within a plane perpendicular to a direction of the optical path of the first light, or/and the set of second lenses is movable within a plane perpendicular to a direction of the optical path of the second light; wherein by adjusting a position of said set of first lenses and/or said set of second lenses in said plane, a position of a center of a light spot formed by the scattered light and/or a position of a center of a light spot formed by the light in the second wavelength range is adjusted, in such a manner that the position of the center of the light spot formed by the scattered light coincides with the position of the center of the light spot formed by the light in the second wavelength range. the laser light source is configured to emit light in a first wavelength range; the transflective optical component is located in an optical path of the light in the first wavelength range, is configured to reflect a part of the light in the first wavelength range to form first light, and is configured to transmit a part of the light in the first wavelength range to form second light; the set of first lenses and the scattering surface are disposed in an optical path of the first light, the first light is guided by the set of first lenses to the scattering surface to form scattered light, and the scattered light is emitted to the set of first lenses and returns to the transflective optical component after being guided by the set of first lenses; the set of second lenses and the excited light generator are disposed in an optical path of the second light, the second light is guided by the set of second lenses to the excited light generator, which generates light in a second wavelength range under excitation, and the light in the second wavelength range is emitted to the set of second lenses and returns to the transflective optical component after being guided by the set of second lenses; the scattered light after being transmitted by the transflective optical component and the light in the second wavelength range after being reflected by the transflective optical component converge into a beam of output light, and the output light is sequentially light-shaped by the relay lens, beam-adjusted by the aperture and emitted by the lens onto a far-field screen to form a desired light spot; and the set of first lenses is movable within a plane perpendicular to a direction of the optical path of the first light, or/and the set of second lenses is movable within a plane perpendicular to a direction of the optical path of the second light; wherein by adjusting a position of said set of first lenses and/or said set of second lenses in said plane, a position of a center of a light spot formed by the scattered light and/or a position of a center of a light spot formed by the light in the second wavelength range is adjusted, in such a manner that the position of the center of the light spot formed by the scattered light coincides with the position of the center of the light spot formed by the light in the second wavelength range.