There are several reasons why Xi 'an Miqi Food Factory signed a summer vacation contract with an intermediary:

1. Flexibility and convenience: By signing a contract with an intermediary, Xi 'an Miqi Food Factory can recruit summer vacation workers more flexibly. Intermediaries usually have their own recruitment channels and resources, which can provide suitable candidates more quickly. This can save the time and energy of Xi 'an Miqi Food Factory and quickly meet the labor demand during the summer vacation.

2. Management and supervision: Intermediaries may have more experience and resources in the recruitment and management of summer workers. They can be responsible for screening, interviewing, training and managing the daily work of summer workers. This can reduce the management burden of Xi 'an Miqi Food Factory and help ensure the quality and performance of summer workers.

3. Law and compliance: By signing a contract with an intermediary, clear labor relations and legal obligations can be established. The contract can regulate the working hours, wages, labor protection, division of responsibilities and other matters of summer workers, and ensure that both parties have clear rights and obligations. This helps to avoid potential labor disputes and legal risks.