Why is social security paid by Chengdu Company in Xi 'an?

According to the relevant information query, the reason why the employer buys social security in different places is to consider the company's headquarters branch and dispatch in different places to confirm whether the labor contract it signed belongs to the company and whether it is a formal employee of the company. If the company that signed the contract is the company's name, it can't be fake, just because of the limitation of the company's location or for the convenience of unified management. If the signing unit of the contract is not our company, then you are not a formal employee of our company, but a dispatch worker, remitted by a human resources company.