Occluded　pedestrian　detection　is　very　challenging　in　computer　vision,　because　the　pedestrians　are　frequently　occluded　by　various　obstacles　or　persons,　especially　in　crowded　scenarios.　In　this　article,　an　occluded　pedestrian　detection　method　is　proposed　under　a　basic　DEtection　TRansformer　(DETR)　framework.　Firstly,　Dynamic　Deformable　Convolution　(DyDC)　and　Gaussian　Projection　Channel　Attention　(GPCA)　mechanism　are　proposed　and　embedded　into　the　low　layer　and　high　layer　of　ResNet50　respectively,　to　improve　the　representation　capability　of　features.　Secondly,　Cascade　Transformer　Decoder　(CTD)　is　proposed,　which　aims　to　generate　high-score　queries,　avoiding　the　influence　of　low-score　queries　in　the　decoder　stage,　further　improving　the　detection　accuracy.　The　proposed　method　is　verified　on　three　challenging　datasets,　namely　CrowdHuman,　WiderPerson,　and　TJU-DHD-pedestrian.　The　experimental　results　show　that,　compared　with　the　state-of-the-art　methods,　it　can　obtain　a　superior　detection　performance.