Conjugated microporous polymers (CMPs) exhibit extended p-conjugated frameworks, and are typically built from aromatic organic building blocks. CMPs decorated with functional groups are of particular interest in catalysis because these functional groups can serve as potential catalytic sites. Despite great efforts have been devoted to the synthesis of functionalized CMPs, there is still much room for the development of functionalized CMPs with stable and accessible catalytic sites. Two TEMPO (2,2,6,6-tetramethylpiperidinyloxy) decorated conjugated microporous polymers (CMPs), named CMP-3-TEMPO and CMP-4-TEMPO by Sonogashira-Hagihara coupling reaction were synthesized in this work. A TEMPO radical appended 2,5-dibromo-N-(2,2,6,6-tetramethylpiperidinyloxy)benzamide serving as a build block and reacted with 1,3,5-triethynylbenzene (trigonal planar, D3h symmetry) and tetrakis(4-ethynylphenyl)methane (tetrahedron geometry, Td symmetry), to form CMP-3-TEMPO and CMP-4-TEMPO, respectively. The as-synthesized CMP-3-TEMPO and CMP-4-TEMPO were characterized by SEM, PXRD, FT-IR, and EPR spectroscopy. Moreover, the catalytic activity of CMP-3-TEMPO and CMP-4-TEMPO toward the selective oxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-diformylfuran (2,5-DEF) were investigated. Importantly, the results indicated that the geometry of organic monomers played a key factor for the morphology and catalytic activity of CMPs. CMP-3-TEMPO consisted of micro-chunks and micro-rods, while CMP-4-TEMPO exhibited microspheres with uniform sites in the range of 2~3 ?m. Catalytic performances indicated that both TEMPO-CMPs enabled the selective oxidation of alcohols to their corresponding aldehydes with high efficiency. However, the stability and reusability of CMP-4-TEMPO was much better than CMP-3-TEMPO, which can be attributed to specific geometry of the corresponding organic monomers. It is anticipated that our findings could provide useful information for the design and synthesis of functionalized CMPs.