A projection apparatus comprising: a first solid-state light-emitting element configured to emit a first waveband light; a phosphor wheel having only a single first section, wherein the single first section contains only a single first phosphor agent, and the Z single first phosphor agent is coated on the single first section; single dichroic element arranged at a front end of an optical path, wherein the first solid-state light-emitting element is located at a first side of the dichroic element, and the phosphor wheel is located at a second side of the dichroic element, wherein the first waveband light emitted from the first solid-state light-emitting element is directly transmitted through the dichroic element and directed to the phosphor wheel, and after the first waveband light is received by the phosphor wheel, the first waveband light is converted into a third waveband light, and wherein the third waveband light is directed to the dichroic element in a direction reverse to the first waveband light, and then the third waveband light is reflected by the dichroic element and directed to the optical path; a second solid-state light-emitting element configured to emit a second waveband light to the optical path, wherein the first solid-state light-emitting element and the second solid-state light-emitting element are both located at the first side of the dichroic element; and an image processing device provided on the optical path, wherein the image processing device is configured to receive the third waveband light and separate the third waveband light into a green light and a red light; wherein a waveband of the third waveband light is wider than a waveband of the first waveband light, and wherein the waveband of the first waveband light is within a waveband of a blue light, and the waveband of the third waveband light covers a waveband of the green light and a waveband of the red light, and wherein the image processing device comprises a first interface and a second interface, the blue light is reflected by the first interface, the red light is reflected by the second interface, the blue light and the red light are combined with the green light, so that an image is projected out to a rear end of the optical path, and the second waveband light from the second solid-state light-emitting element is transmitted through the dichroic element and directed to the image processing device at the rear end of the optical path. a first solid-state light-emitting element configured to emit a first waveband light; a phosphor wheel having only a single first section, wherein the single first section contains only a single first phosphor agent, and the Z single first phosphor agent is coated on the single first section; single dichroic element arranged at a front end of an optical path, wherein the first solid-state light-emitting element is located at a first side of the dichroic element, and the phosphor wheel is located at a second side of the dichroic element, wherein the first waveband light emitted from the first solid-state light-emitting element is directly transmitted through the dichroic element and directed to the phosphor wheel, and after the first waveband light is received by the phosphor wheel, the first waveband light is converted into a third waveband light, and wherein the third waveband light is directed to the dichroic element in a direction reverse to the first waveband light, and then the third waveband light is reflected by the dichroic element and directed to the optical path; a second solid-state light-emitting element configured to emit a second waveband light to the optical path, wherein the first solid-state light-emitting element and the second solid-state light-emitting element are both located at the first side of the dichroic element; and an image processing device provided on the optical path, wherein the image processing device is configured to receive the third waveband light and separate the third waveband light into a green light and a red light; wherein a waveband of the third waveband light is wider than a waveband of the first waveband light, and wherein the waveband of the first waveband light is within a waveband of a blue light, and the waveband of the third waveband light covers a waveband of the green light and a waveband of the red light, and wherein the image processing device comprises a first interface and a second interface, the blue light is reflected by the first interface, the red light is reflected by the second interface, the blue light and the red light are combined with the green light, so that an image is projected out to a rear end of the optical path, and the second waveband light from the second solid-state light-emitting element is transmitted through the dichroic element and directed to the image processing device at the rear end of the optical path.