"156" refers to a scoring system in EB- 1A green card application in the United States, also known as "outstanding talent green card". EB- 1A is a kind of American green card application, which is suitable for people with outstanding abilities in science, art, education, business or sports. Applicants need to meet certain conditions to prove their outstanding abilities and achievements, including winning national or international awards, working in senior positions, publishing important papers or articles, etc. One of the conditions is to meet the "156" scoring system, that is, the applicant needs to score at least 10 in at least three aspects, totaling 156 or above. These three aspects can be the applicant's achievements, awards, published articles or papers, work experience and so on. If applicants can meet all the conditions of EB- 1A green card, including the "156" scoring system, then they will have the opportunity to obtain a green card for outstanding talents in the United States, thus gaining the right to live and work in the United States for a long time.