Aiming at the deficiency of practical quantitative evaluation models and methodologies for usability design of webpage layout，this paper applies eye-tracking method to model network users’browsing behavior on web pages as the points randomly walking on empowering finite graphs based on scanning paths theory． A novel and practical method for usability evaluation of web page layout (WLUE-RWG) is proposed． Finally， two product display pages，namely，mall． taobao． com and china． alibaba． com，are used as examples to verify the feasibility and effectiveness of our method．