Over than 200 years, the phenomena of liquid drop impact have been investigated. We can find these phenomena in our daily lives. The simple example is raindrop. We can see that a falling of liquid droplet can exhibit a variety of behaviors. From this simple intuition, the author designs a system in order to observe this phenomenon. Drop impact is a complex interaction of fluid. Generally, there are two possible outcomes of droplet impact onto a solid and dry surface, liquid droplet might deposit on the surface and form a liquid film or the droplet would splash and produce secondary droplets. With good understanding of these concepts; the author write this book to provides basic knowledge, clear investigation results of drop impact phenomena, new method to find-out the droplet size and center of mass when droplet oscillates in the air, and equations to calculate the energy dissipation which occurred before and after impact. This book will be a great foundation and useful guidance for professionals, engineers, or anyone else who have relation with petrochemicals and/or other field industries to design or optimize equipments.