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In this paper, an optimized transmitting power allocation scheme between the source and its cooperator is presented, minimizing the derived closed-form approximated outage probability expressions for the separately adopted maximum ratio combining (MRC) algorithm and selective diversity combining (SDC) algorithm at the satellite. The circumstance considered is the uplink of a dual-hop land mobile satellite cooperative diversity communication system with decode-and-forward (DF) protocol. Simulation results illustrate that the optimized power allocation scheme excellently outperforms the conventional uniform power allocation scheme on outage probability. The preferable choice of the combing algorithm between MRC and SDC in terms of the minimal outage probabilities changes with the variation of the maximum power allowed to consuming for transmitting a packet.