1. A focusing method for a moving object which utilizes a photographic instrument to take images of a moving object, and focuses said photographic instrument by means of a pattern matching method, comprises the following steps: set an optimal matching pattern position; retrieve a serial image of said moving object; acquire an initial pattern of said moving object and an initial pattern position according to said serial image; and compare said initial pattern position and said optimal matching pattern position so as to make an adjustment in the photographic angle of said photographic instrument.