Exhibit A

EXHIBIT A

Joint Filing Agreement

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned hereby agrees to the joint filing with each other Reporting Person (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Class A Ordinary Shares, par value US$0.01 per share, of BEST Inc., an exempted company incorporated under the laws of the Cayman Islands, and that this Agreement may be included as an Exhibit to such joint filing.  This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of October 19, 2017.

Alibaba Group Holding Limited
By:	/s/ Timothy A. Steinert
	Name:	Timothy A. Steinert
	Title:	General Counsel and Secretary
Alibaba Investment Limited
By:	/s/ Timothy A. Steinert
	Name:	Timothy A. Steinert
	Title:	Director
Ali CN Investment Holding Limited
By:	/s/ Timothy A. Steinert
	Name:	Timothy A. Steinert
	Title:	Director
Cainiao Smart Logistics Network Limited
By:	/s/ Lin Wan
	Name:	Lin Wan
	Title:	Director and President
Cainiao Smart Logistics Investment Limited
By:	/s/ Lin Wan
	Name:	Lin Wan
	Title:	Director