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Aiming at the working principles, structure, working character and performance index and etc, the comparative analysis of integrated power plunger pump and internal combustion engine driving plunger pump system was carried out. It is shown that the former had smaller volume, slighter weight, compacter structure, lower cost, and easier match etc. The simulation results demonstrated that many performance indexes of the former, such as effective thermal efficiency, fuel consumption, running unevenness, effective work, output pressure and so on have been improved obviously compared to the latter, but flow decreased slightly.