Can the social security of subsidiaries be paid by the parent company?

You can't. According to the query of official website of China Bidding Network, the subsidiary is an independent legal person, so it cannot directly use the social security qualification paid by the parent company to bid. The tenderer requires the social security payment unit to be consistent with the tendering unit, so as to ensure that the tendering unit has legal and independent business ability and protect the legitimate rights and interests of employees.