Abstract: In this paper, the advantages and disadvantages of predecessors’methods are discussed, and the pseudo sonic log recomposition technique based on multiple well logs is proposed to be used for logging?constrained inversion for the purpose of reservoir prediction. The technique is based on two principles in the recomposition: one is the low?frequency changing trend of interval transit time should accord with the formation compaction regulation; the other is its high?frequency part should enable to well distinguish related lithology. The recomposition include wavelet transform spectrum decomposition, multiple regression, dimension conversion, arithmetical operation, etc. The practical log data processing shows that the recomposition well logs can not only remain the original geologic characteristics, but also obviously improve the sand resolution, it can highlight the difference from the surrounding rocks, hence provide solid support in sonic log datafor wave impedance inversion