A projection apparatus comprising: an illumination system, comprising: a first solid-state light-emitting element directly emitting a first waveband light; a second solid-state light-emitting element directly emitting a second waveband light; and a phosphor wheel (40, 45), having: a first section (401, 451) and a second section containing a first phosphor agent and a second phosphor agent, wherein the first phosphor agent is coated on the first section (401, 451), the second phosphor agent is coated on the second section, so that the first waveband light is received by the phosphor wheel (40, 45) and converted into a third waveband light, which is directed to an optical path, wherein compositions of the first phosphor agent and the second phosphor agent are different, so that the first waveband light is converted into two kinds of the third waveband light which are time-sequentially directed to the optical path; and a dichroic element introducing the second waveband light and the third waveband light into the optical path; and an image processing device configured to receive the second waveband light and the third waveband light from the dichroic element and separate the third waveband light into a first light and a second light, wherein the first waveband light and the second waveband light are lights within different wavebands, and a waveband of the third waveband light is wider than a waveband of the first waveband light, wherein the first phosphor agent and the second phosphor agent are yellow phosphor agents, green phosphor agents or yellow-green phosphor agents, so that the range of the waveband of the two kinds of the third waveband light converted from the first waveband light is between 450nm and 710nm. an illumination system, comprising: a first solid-state light-emitting element directly emitting a first waveband light; a second solid-state light-emitting element directly emitting a second waveband light; and a phosphor wheel (40, 45), having: a first section (401, 451) and a second section containing a first phosphor agent and a second phosphor agent, wherein the first phosphor agent is coated on the first section (401, 451), the second phosphor agent is coated on the second section, so that the first waveband light is received by the phosphor wheel (40, 45) and converted into a third waveband light, which is directed to an optical path, wherein compositions of the first phosphor agent and the second phosphor agent are different, so that the first waveband light is converted into two kinds of the third waveband light which are time-sequentially directed to the optical path; and a dichroic element introducing the second waveband light and the third waveband light into the optical path; and a first solid-state light-emitting element directly emitting a first waveband light; a second solid-state light-emitting element directly emitting a second waveband light; and a phosphor wheel (40, 45), having: a first section (401, 451) and a second section containing a first phosphor agent and a second phosphor agent, wherein the first phosphor agent is coated on the first section (401, 451), the second phosphor agent is coated on the second section, so that the first waveband light is received by the phosphor wheel (40, 45) and converted into a third waveband light, which is directed to an optical path, wherein compositions of the first phosphor agent and the second phosphor agent are different, so that the first waveband light is converted into two kinds of the third waveband light which are time-sequentially directed to the optical path; and a first section (401, 451) and a second section containing a first phosphor agent and a second phosphor agent, wherein the first phosphor agent is coated on the first section (401, 451), the second phosphor agent is coated on the second section, so that the first waveband light is received by the phosphor wheel (40, 45) and converted into a third waveband light, which is directed to an optical path, wherein compositions of the first phosphor agent and the second phosphor agent are different, so that the first waveband light is converted into two kinds of the third waveband light which are time-sequentially directed to the optical path; and a dichroic element introducing the second waveband light and the third waveband light into the optical path; and an image processing device configured to receive the second waveband light and the third waveband light from the dichroic element and separate the third waveband light into a first light and a second light, wherein the first waveband light and the second waveband light are lights within different wavebands, and a waveband of the third waveband light is wider than a waveband of the first waveband light, wherein the first phosphor agent and the second phosphor agent are yellow phosphor agents, green phosphor agents or yellow-green phosphor agents, so that the range of the waveband of the two kinds of the third waveband light converted from the first waveband light is between 450nm and 710nm.