The reason of internal recruitment can attract talents quickly. Starting the internal recruitment process before school recruitment can attract a large number of outstanding talents before school recruitment. It is also a direct corporate publicity activity. At the same time, internal recruitment saves time and effort and is more efficient than other recruitment. Social recruitment and internal promotion are generally open all year round, there is no time limit, and people with work experience are required. The internal promotion of school recruitment is different for each company. It is time-sensitive, and each company's internal promotion also has certain immunity, some are exempt from written examination, some are exempt from resume screening, and some can even go directly to professional interviews.