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REVENUE (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue recognition
Net revenue	¥ 5,738,972	¥ 4,122,405	¥ 2,792,077
Service revenue
Revenue recognition
Net revenue	5,716,868	4,094,571	2,759,490
Colocation services
Revenue recognition
Net revenue	4,710,923	3,261,745	2,104,259
Managed service and others
Revenue recognition
Net revenue	1,005,945	832,826	655,231
Equipment Sales
Revenue recognition
Net revenue	¥ 22,104	¥ 27,834	¥ 32,587

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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