In this paper, I have presented an analysis on the current technical details and the practical use in the field of Mobile Augmented Reality. Mobile Augmented Reality technology offers very unique experiences for users to interact with surroundings, and the use of mobile phones with MAR allows these experiences to be extended with visibility. Moreover, I have developed a sample application that can simultaneously recognize room number by means of optical character recognition using Mobile Augmented Reality technology.The MAR demonstrator achieves the task that superimposes augmented schedule information on to the mobile screen.Several experiments were carried out to evaluate the application.A few problems in room number recognition have been identified,including varying viewing angles and different distances between observer and door.The experimental results showed room numbers can be correctly recognized by using the MAR demonstrator. The recognition rate was an average of 91%in continuous real timetesting.This has been proved through several experiments.Despite their limited computation power, I think mobile device is the perfect platform for who want a truly immersive augmented reality experience.Most of mobile devices are equipped with a digital camera on the back, which provides a nature way to achieve see-through effect at affordable cost.