Abstract: On the basis of Chinese double-phonetic compound words, codeadditivity was carried out according to morphological, phonetic, andsemantic relationships of Chinese words, it was confirmed that Chinesewords and phrases can be used as suitable verbal materials and toprovide a new way for the research of verbal memory. The effects of code additivity is not mainly reflected in the processof acquirement of verbal memory, since verbal materials of both multiplecode and single code all possess approximately equal acquirement levels.However, effects of code additivity manifested both in spontaneousrecovery and in fransition from short-term memory to long-termmemory.It could be considered that the effects of code additivity mainlyinfluence longterm retention and retrieval of information, and not ofmuch influence to the acquirement of information. In addition, thenumber of encoded dimensions of words, as an independent variable,seems unrelated to the serial-position curve under free-recall.

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