The letter of political examination for joining the party was written by the village party organization. Corresponding to joining the party refers to the abbreviation of going out for inspection. Correspondence refers to the investigation of social relations before joining the party written by the village party organization, and stamped with the official seal of the organization department of the town party organization after completion. At the same time, it must be indicated in the letter that what is said in the letter is true and then sent back to the sending unit. This correspondence can be used as the basis for external inspection to determine whether the development object has been absorbed.