A web-side platform for rendering realistic skin based on three layers skin model is designed in web browser. Previous work on rendering realistic skin has been limited by client-side. We introduce WebGL technique that enables plugin-free running of a high-quality and realistic skin application with 3D graphics rendering and physics effects. For reducing rendering time, we propose a solution to the large computation problem by precomputing several 2D texture lookup tables. To enhance realism of rendering human skin, an improved bidirectional reflectance distribution function and sum-of-Gaussians diffusion profile are provided for efficiently approximating skin surface reflectance and subsurface scattering respectively. Different from using OpenGL, a new method is presented to compute a stretch-correction texture by convolving world-space coordinates texture. Combining specular reflection approximation with subsurface scattering approximation, an experiment is implemented to verify that a realistic human face skin can be rendered on web-side and the result is more realistic than using Phong model.