The user experience influencing factors of smart mobile phone is explored in order to assess its quality. At first, we discover user experience influencing factors of smart mobile phone and establish user experience quality assessment model with grounded theory, which include both environmental experience and user experience, then calculate the weight for each factor with analytic hierarchy process: interaction (0.115), usability (0.283), durability (0.091), innovation (0.104), screen vision (0.098), appearance design (0.071), touch experience (0.057), entertainment(0.133), emotional beggar (0.048), and first four key influencing factors are discovered as follows: usability, entertainment, interaction and innovation. Finally, the model is verified through quality assessment for five smart mobile phones, we hope that it can give some inspiration to mobile phone manufacturers and operators.