High-temperature　superconducting　(HTS)　filters　have　advantages　of　extreme　low　insertion　loss　and　high　selectivity　of　passbands.　In　this　paper,　three　types　of　multi-band　HTS　bandpass　filters　(BPFs)　using　multimode　square　ring　loaded　resonators　(SRLRs)　are　presented.　The　traditional　SRLR　has　four　resonant　modes　and　the　first　one　is　a　miniaturized　quad-band　HTS　filter　using　two　coupled　four-mode　SRLRs　with　ultra-low　insertion　losses　in　four　passbands.　Next,　two　stubs　at　two　sides　of　SRLR　are　folded　to　a　hairpin　ring　shape　for　high-order　circuit　design,　thus　a　eighth-order　dual-band　HTS　BPF　using　the　modified　SRLR　is　designed　with　high　selectivity　passbands.　To　reject　common　mode　interference,　a　newly　modified　SRLR　with　shunt-ed-line　structure　is　proposed　and　them　a　four　ports　dual-band　HTS　differential　filter　is　developed.　All　these　BPFs　shown　favorable　performance.　©　2020　IEEE.