LED packaging is crucial for the development of solid-state lighting. The common method of making WLED is to mix the blue light from the LED die and the wavelength converted yellow light from the phosphor layer. We discuss the influence of phosphor concentration and drive current intensity on white LED characteristics. Software simulations and real packagings are adopted for the study. Influences of phosphor concentration on luminous flux and correlated color temperature (CCT) for white LED are investigated with three-dimensional ray tracing simulations and the results are verified by real packaging. In addition, junction temperature and color rendering of white LED are also investigated. The results show that CCT decreases with the increase of phosphor concentration, however, luminous flux achieves an optimal value and then decreases. The increased junction temperature caused by phosphor concentration and drive current intensity change degrades the phosphor conversion efficiency. For the color rendering of white LED, a higher phosphor concentration leads to a lower color rendering index, and the color rendering index increases with the increase of drive current intensity till it achieves stabilization.