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
