This paper present a parallel approach about mobile web browsing, especially layout and paint parts. Web browser is one of the most frequently used applications in mobile devices and performance of web browser is an important factor affecting mobile device user experience. From our previous research, we found that layout and paint takes significant portion of web browser execution time and has similar execution characteristics. In this paper, we propose parallel render tree traversal algorithm for layout and paint parts in web browser: creating thread for sub-tree traversal processing. Moreover, to validate proposed Algorithm, we design a simple simulation implementing parallel tree traversal with web page render tree. The experiment results show that execution time is reduced average 28% in dual-core, 32% in quad-core compare to single-thread execution in paint simulation. In layout simulation, average 38% in dual-core, 57% in quad-core execution time is reduced.