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In this paper, we introduce a dynamic allocation investment mechanism into the spatial public goods game. In the model, if a cooperator i collects more payoffs from one group centered on the player j in the last round, he will put more investments to the group in the next round. The intensity of investment is controlled by a tunable parameter α. Simulation results show that the emergence of cooperation is remarkably promoted, and a larger α induces a higher cooperation level. These interesting phenomena are then extensively explained by pairwise investments, average payoffs and evolution snapshots.