Abstract: At present, researches on the formation of Chinese unequal synonymous paratactic disyllable only reach the phase ofclassifying the formation pattern into parataxis, and no researches have done on how the two morphemes are paratactic. On the premisethat the two morphemes are not absolutely equal, this paper puts forward three types of parataxis: post-modifier, pre-modifier andattached. The unequal synonymous parataxis with pre-modifier and post-modifier plays the same semantic role as modification structureand verb complement structure. And this cross-structure semantic consistency reflects the requirement of disyllabization and semanticprecision in Chinese.