Objective To investigate the expression of PHLPP in non-small cell lung cancer (NSCLC)and its correla-tions of clinicopathological characteristics. Methods All of 82 tissue specimens with NSCLC were examined with im-munohistochemical staining, and the results of IHC were analyzed with the clinicopathologic characteristics. Results PHLPP mainly expressed on the cell membrane. The rate of PHLPP expression was negative in 63%, poor in 11%, moderate in 10% and strong in 16%, respectively. The expression of PHLPP was significantly correlated with differen-tiation, but not with age, smoking states, pathological type and stage. Conclusion The positive expression rate of PHLPP is 37%in human NSCLC tissue specimens and was correlated with histological differentiation .