The temperature oflaser-produced Al plasmas (LPP) have been measured at different laser energy by using themodel of local thermodynamic equilibrium (LTE). The electron temperature changed from14800 K to 20000 K when the laser energy increased from 30 mJ/pulse to 45 mJ/pulse, then ,the temperature had some decrease along the laser energy increasing. The intensities of AlⅠ spectra lines haveshown similar variant property, but differetnt from other Al ions spectra lines.Meanwhile, the transition probability of 447.99 nm line of Al Ⅲ was measured by the Boltzmann plots was about (9～10)× 108/ s-1/.