Out-of-plane and in-plane reorientations of mesogens were observed upon a linearly polarized light irradiation of azobenzene containing side-chain liquid crystalline polymer, which were characterized by the transmission various and polarized optical microscopy observation of the pumped film. Higher power density polarized light (20 mW/cm2) irradiation on the film induces that a maximal value of the photoinduced transmission is firstly obtained and then a decrease in the transmission value was observered. This suggests an out-of-plain orientation happened. Out-of-plane orientation decreases the stability of the oriented mesogens, which is confirmed by the lost of the anisotropy when the exposure light turn-off. The in-plane and out-of-plane reorientation depend on the laser fluence. The photoinduced anisotropy measurements results reveal that a stable orientation occurred by using an unsaturated irradiation upon a low power density laser beam. The unsaturated irradiation enables to shorten 95% of the incident time and increases the orientation order 1.3 times as compared to that of full orientation. A quick and high stable bit recording is achieved by unsaturated orientation upon 4 ms light irradiation.