The pigeon-hole principle's utilization domain is widespread， it is in a combinatorics most cardinal principle， may solve using the pigeon-hole principle many involves the existence combination In the 20th century period， many research are aim at the pigeon-hole principle the promotion， has achieved the crest in the Ramsey Is precisely as a result of the pigeon-hole principle utilization universality， but in view of different type topic explanation method existence very big difference， therefore the pigeon-hole principle's structure method is also many and This article has carried on the reorganization， the summary in view of these methods， has formed seven commonly used structure
Abstracts: Principle of the use of holes for a broad range， it is a mathematical combination of the most basic principle， the application of the principle holes can solve many problems concerning the existence of a combination of In the 20th century， many studies are directed at holes the promotion of the principle， Ramsey theory， in which reached its It is precisely because of the extensive use of pigeon holes principle， and subject to different types of answers to very different methods， so the principle of the structure of holes is also a variety of In this paper， these methods have been collated and summarized to form seven commonly used construction Keywords: pigeonhole principle; structure; pigeons; cage; Category
