The present invention discloses a system for generating a software TLM model, comprising a processing unit; a compiler coupled to the processing unit to generate target binary codes of a target software; a decompiler coupled to the processing unit to decompile the target binary codes into high level codes, for example C or C++ codes, to generate a functional model of the target software, wherein the functional model includes a plurality of basic blocks; an execution time calculating module coupled to the processing unit to calculate overall execution time of the plurality of the basic blocks of the functional model; a sync point identifying module coupled to the processing unit to identify sync points of the software transaction-level modeling model; and a time annotating module coupled to the processing unit to annotate the overall execution time of the basic blocks and the sync points into the functional model to obtain the software transaction-level modeling model.