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This study aims to analyze conception, threshold concepts, and troublesome knowledge in redox reactions. This study uses a qualitative method by analyzing journal articles which presented research studies about conception. Beside, this study also conducted interviews with five chemistry teachers to obtain information about the thresholds concept and troublesome knowledge. Based on the analysis of the journal about conception for redox reaction, the majority of students answered questions correctly regarding the concept of the definition of oxidation numbers based on binding and releasing oxygen, determining reducing and oxidizing agents. In contrast, most students experience a misconception about the concept of oxidation and electron transfer, which is to assume that the charge on the molecule and polyatomic ion is an oxidation number, changes in charges on polyatomic ions and molecules can be used to identify oxidized and reduced species, and electron transfer occurs as the bond between cation and spectator ion breaks/ forms. Meanwhile the threshold concept are position of elements based on groups, proust laws, equation of reaction, electronegativity, symbols and element names, and chemical nomenclature. While troublesome knowledge for redox reactions are an abstract concept, complexity in determining oxidation numbers, complexity in using definitions, and language used.