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In this paper,a meta-structure of piano accompaniment figure (meta-structure for short) is proposed to harmonize a melodic piece of music so as to construct a multi-voice music.Here we approach melody harmonization with piano accompaniment as a machine learning task in a probabilistic framework.A series of piano accompaniment figures are collected from the massive existing sample scores and converted into a set of meta-structure.After the procedure of samples training,a model is formulated to generate a proper piano accompaniment figure for a harmonizing unit in the context.This model is flexible in harmonizing a melody with piano accompaniment.The experimental results are evaluated and discussed.