Through　a　simple　and　effective　method　for　preparing　broadband　reflective　liquid　crystal　films,　the　advantages　of　the　three-layer　system　are　expanded　based　on　the　two-layer　system.　The　cholesteric　liquid　crystals　form　a　prepolymerized　layer　after　semi-curing.　In　the　design　of　the　top　prepolymerization　layer,　there　is　less　content　of　the　chiral　compound　R5011,　which　results　in　the　formation　of　cholesteric　liquid　crystal　molecules　with　a　larger　pitch.　Mainly　by　controlling　the　content　of　polymerizable　monomers　and　UV-absorbing　dyes　in　cholesteric　liquid　crystals　(CLCs),　a　polymer　network　with　density　gradient　distribution　suitable　for　substance　diffusion　is　formed,　and　the　oleophobic　substrate　on　one　side　of　the　low-density　polymer　network　is　more　likely　to　be　peeled　off.　In　the　design　of　the　lowest　prepolymerization　layer,　the　content　of　R5011　is　higher,　which　results　in　the　formation　of　cholesteric　liquid　crystals　with　a　larger　pitch.　One　side　substrate　of　two　cholesteric　liquid　crystal　cassettes　is　peeled　off　and　merged　into　a　new　liquid　crystal　cassette　whose　left　and　right　sides　are　stacked　with　septum　pads　(20　mu　m),　and　the　nematic　liquid　crystals　are　poured　into　the　middle　layer　to　form　a　three-layer　integrated　film.　The　polymer　network　of　the　polymer-stabilized　cholesteric　liquid　crystals　(PSCLCs)　itself　in　the　bilayer　was　used　as　a　diffusion　channel.　Chiral　compounds　and　UV-absorbing　dyes　were　diffused　from　the　cholesteric　liquid　crystal　layer　to　the　intermediate　nematic　liquid　crystal　layer　by　diffusion　gradient　method,　resulting　in　liquid　crystal　films　with　arbitrary　wavelength　bands　and　ultrawide　broadband　reflection.