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This research is managed to present in-depth description on passive clauses through pattern and formation of passive predicate and passive sentence structure in Lampung language. To get the data, this research employs text taken from lesson books of Lampung language and the parts, which are examined, are passages. Related to collecting data from the text, documentary search is applied here. The findings confirm that affixation process forms passive predicate. The configuration consists of a prefix pertained to a root word. Also, it can be a combination prefix and suffix pertaining to a root word. It is revealed that there are four prefixes forming passive predicate, they are ‘di-’, ‘ti-’, ‘ke-’, and ‘te-’ and there are three suffixes, which are sometimes employed in passive configuration, they are ‘-ko/-kon/-ken’, ‘-i’, and ‘-ni’. It is noteworthy that the suffixes (-ko, -kon, and -ken) basically show similar meaning and function because they just come from different dialect. Furthermore, the root words, which can form passive predicate through affixation processes, are in three word categories, those are verb, noun, and adjective. Furthremore, it reveals that verb is the majority of word category, which forms passive predicate.