In　this　work,　we　investigate　photon　localization　and　filtering　effects　in　disordered　scattering　structures　which　might　be　used　for　future　on-chip　terahertz　integrated　systems.　Through　a　reverse-design　platform　based　on　a　discrete　binary　particle　swarm　optimization　(BPSO)　algorithm,　a　2-D　periodic　dielectric　cylindrical　photonic　crystal　was　transformed　into　a　disordered　scattering　structure.　Appropriate　objective　and　figure　of　merit　(FOM)　functions　are　defined　in　order　to　achieve　terahertz　filtering　function　based　on　Anderson　localization.　The　filters　are　in　the　bandgap　range　of　0.177-0.303　THz,　with　a　FWHM　bandwidth　of　0.01　THz.　We　found　that　photon　localization　in　disordered　scattering　structures　is　caused　by　coupling　and　resonance　between　adjacent　microcavities.