This video from the Certified Horsemanship Association will show how to safely and effectively catch a horse in a herd. It will talk about horse herd dynamics, pecking order, how to halter and lead correctly and much more!
Domestic horses instinctively want to be in a herd, and readily form herds if maintained on pasture. The desire for contact with other horses can result in horses running back and forth along the fence line or running through the fence if left alone in a field or paddock.
In terms of how to catch a horse, a great way to start is by changing a horse's opinion of being caught. In order to allow himself to be caught, your horse has to fight the natural instincts that have programmed him to flee from predators and any perception of danger. Don't blame him for running from you; he is acting out of self preservation.