查看“排期表的制定”的源代码

==法律法规==
法律自然就是移民法，法规指的是 美国联邦法规 [https://www.law.cornell.edu/cfr/text/22/part-42/subpart-F 22 CFR Chapter I, Subchapter E, Part 42, Subpart F - Numerical Controls and Priority Dates]，这是对移民法种的要求的具体实施。可以看到，除了2013年加了一段”Entitlement to immigrant classification”以外，对应法规全部都是90年代的产物，近20年没有更新过。

=== §42.51   Department control of numerical limitations. ===
(a) ''Centralized control.'' Centralized control of the numerical limitations on immigration specified in INA 201, 202, and 203 is established in the Department. The Department shall limit the number of immigrant visas that may be issued and the number of adjustments of status that may be granted to aliens subject to these numerical limitations to a number:

(1) Not to exceed 27 percent of the world-wide total made available under INA 203 (a), (b) and (c) in any of the first three quarters of any fiscal year; and

(2) Not to exceed, in any month of a fiscal year, 10% of the world-wide total made available under INA 203 (a), (b) and (c) plus any balance remaining from authorizations for preceding months in the same fiscal year.

(b) ''Allocation of numbers.'' Within the foregoing limitations, the Department shall allocate immigrant visa numbers for use in connection with the issuance of immigrant visas and adjustments based on the chronological order of the priority dates of visa applicants classified under INA 203 (a) and (b) reported by consular officers pursuant to §42.55(b) and of applicants for adjustment of status as reported by officers of the DHS, taking into account the requirements of INA 202(e) in such allocations. In the case of applicants under INA 203(c), visa numbers shall be allocated within the limitation for each specified geographical region in the random order determined in accordance with sec. 42.33(c) of this part.

(c) ''Recaptured visa numbers.'' An immigrant visa number shall be returned to the Department for reallocation within the fiscal year in which the visa was issued when:

(1) An immigrant having an immigrant visa is excluded from the United States and deported;

(2) An immigrant does not apply for admission to the United States before the expiration of the validity of the visa;

(3) An alien having a preference immigrant visa is found not to be a preference immigrant; or

(4) An immigrant visa is revoked pursuant to §42.82.

[56 FR 51174, Oct. 10, 1991, as amended at 59 FR 15302, Mar. 31, 1994; 63 FR 48578, Sept. 11, 1998]

=== §42.52   Post records of visa applications. ===
(a) ''Waiting list.'' Records of individual visa applicants entitled to an immigrant classification and their priority dates shall be maintained at posts at which immigrant visas are issued. These records shall indicate the chronological and preferential order in which consideration may be given to immigrant visa applications within the several immigrant classifications subject to the numerical limitations specified in INA 201, 202, and 203. Similar records shall be kept for the classes specified in INA 201(b)(2) and 101(a)(27) (A) and (B) which are not subject to numerical limitations. The records which pertain to applicants subject to numerical limitations constitute “waiting lists” within the meaning of INA 203(e)(3) as redesignated by the Immigration Act of 1990.

(b) ''Entitlement to immigrant classification.'' An alien shall be entitled to immigrant classification if the alien:

(1) Is the beneficiary of an approved petition according immediate relative or preference status;

(2) Has satisfied the consular officer that the alien is entitled to special immigrant status under INA(101)(a)(27) (A) or (B);

(3) Is entitled to status as a Vietnam Amerasian under section 584(b)(1) of section 101(e) of Public Law 100-202 as amended by Public Law 101-167 and re-amended by Public Law 101-513; or

(4) Beginning in FY-95, is entitled to status as a diversity immigrant under INA 203(c).

(c) ''Record made when entitlement to immigrant classification is established.'' (1) A record that an alien is entitled to an immigrant visa classification shall be made whenever the consular officer is satisfied—or receives evidence—that the alien is within the criteria set forth in paragraph (b) of this section.

(2) A separate record shall be made of family members entitled to derivative immigrant status whenever the consular officer determines that a spouse or child is chargeable to a different foreign state or other numerical limitation than the principal alien. The provisions of INA 202(b) are to be applied as appropriate when either the spouse or parent is reached on the waiting list.

(3) A separate record shall be made of a spouse or child entitled to derivative immigrant status whenever the consular officer determines that the principal alien intends to precede the family.

[56 FR 51174, Oct. 9, 1991, as amended at 61 FR 1836, Jan. 24, 1996; 78 FR 31399, May 24, 2013]

=== §42.53   Priority date of individual applicants. ===
(a) ''Preference applicant.'' The priority date of a preference visa applicant under INA 203 (a) or (b) shall be the filng date of the approved petition that accorded preference status.

(b) ''Former Western Hemisphere applicant with priority date prior to January 1, 1977.'' Notwithstanding the provisions of paragraph (a) of this section, an alien who, prior to January 1, 1977, was subject to the numerical limitation specified in section 21(e) of the Act of October 3, 1965, and who was registered as a Western Hemisphere immigrant with a priority date prior to January 1, 1977, shall retain that priority date as a preference immigrant upon approval of a petition according status under INA 203 (a) or (b).

(c) ''Derivative priority date for spouse or child of principal alien.'' A spouse or child of a principal alien acquired prior to the principal alien's admission shall be entitled to the priority date of the principal alien, whether or not named in the immigrant visa application of the principal alien. A child born of a marriage which existed at the time of a principal alien's admission to the United States is considered to have been acquired prior to the principal alien's admission.

=== §42.54   Order of consideration. ===
(a) ''General.'' Consular officers shall request applicants to take the steps necessary to meet the requirements of INA 222(b) in order to apply formally for a visa as follows:

(1) In the chronological order of the priority dates of all applicants within each of the immigrant classifications specified in INA 203 (a) and (b); and

(2) In the random order established by the Secretary of State for each region for the fiscal year for applicants entitled to status under INA 203(c).

(b) [Reserved]

[56 FR 51174, Oct. 10, 1991, as amended at 59 FR 15302, Mar. 31, 1994; 61 FR 1836, Jan. 24, 1996; 63 FR 48578, Sept. 11, 1998]

=== §42.55   Reports on numbers and priority dates of applications on record. ===
(a) Consular officers shall report periodically, as the Department may direct, the number and priority dates of all applicants subject to the numerical limitations prescribed in INA 201, 202, and 203 whose immigrant visa applications have been recorded in accordance with §42.52(c).

(b) ''Documentarily qualified applicants.'' Consular officers shall also report periodically, as the Department may direct, the number and priority dates of all applicants described in paragraph (a) of this section who have informed the consular office that they have obtained the documents required under INA 222(b), for whom the necessary clearance procedures have been completed.

[56 FR 51174, Oct. 10, 1991, as amended at 61 FR 1836, Jan. 24, 1996]

==排期表的制定==
国务院对外发布的 [https://travel.state.gov/content/dam/visas/Statistics/Immigrant-Statistics/Immigrant%20Visa%20Control%20System_operation%20of.pdf The Operation of the Immigrant Numerical Control System] 一文，描述了排期表的指定方法<br />