The transfer letter of political examination for joining the Party must be stamped with the official seal of the Party organization (Party committee, general party branch or party branch). If the proof material exceeds two pages, the right side of the material paper should be stamped with the seal of riding seam, and all seams should be covered, that is, each page of the proof material should be printed in red, and the first page and the last page should have words at the same time, not only red circles (only red circles are easy to falsify), but also missing pages. The development of certification materials should be able to restore the riding seal to the original official seal. Only in this way can it be a more standardized riding seal and play its role. Joining the party and turning to political examination is one of the common inspection methods in party affairs. It refers to the way of sending a letter in the name of the organization to ask the other party's relevant organizations to assist in the investigation and issue the results of the investigation on the important relations such as immediate family members who intend to join the party in other places, which is inconvenient for direct investigation. The contents of the survey include: historical and realistic political performance, class composition (occupation, political views, etc. ), whether there are political issues, etc. It is best to send letters by registered mail or EMS, which can shorten the time and ensure the smooth delivery of letters.