ER&ICU Skill is an APP that collects the videos of the frequently used rescue and other operating skills in the ER, including central vena catheterization, endotracheal intubation, mechanical ventilation technology, continuous vena-venous hemofiltration, emergency ultrasound and so on. 3-D technology is widely used in the videos to describe the anatomical structure and the standard process intuitively and vividly, present the common errors encountered in the clinical practice and render some useful solutions. No matter which level you are in, novice or very experienced, you will gain a lot from these videos.