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INTANGIBLE ASSETS (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible assets disclosures    
Intangible assets ¥ 14,494,943,771 ¥ 14,278,779,458
Less: accumulated amortization (744,627,850) (354,009,527)
Net book value 13,750,315,921 13,924,769,931
Trademark and domain    
Intangible assets disclosures    
Intangible assets not subject to amortization 11,613,475,256 11,613,475,256
Net book value - intangible assets not subject to amortization 11,613,475,256 11,613,475,256
Others    
Intangible assets disclosures    
Intangible assets not subject to amortization 180,248,087 22,140,607
Net book value - intangible assets not subject to amortization ¥ 180,248,087 22,140,607
Minimum    
Intangible assets disclosures    
Intangible asset useful life 3 years  
Maximum    
Intangible assets disclosures    
Intangible asset useful life 10 years  
Business Relationship    
Intangible assets disclosures    
Intangible assets to be amortized ¥ 1,800,260,144 1,815,034,491
Less: accumulated amortization (420,311,754) (175,130,119)
Net book value - intangible assets to be amortized ¥ 1,379,948,390 1,639,904,372
Business Relationship | Minimum    
Intangible assets disclosures    
Intangible asset useful life 5 years  
Business Relationship | Maximum    
Intangible assets disclosures    
Intangible asset useful life 10 years  
Technology    
Intangible assets disclosures    
Intangible assets to be amortized ¥ 713,220,819 696,499,639
Less: accumulated amortization (229,246,477) (110,511,387)
Net book value - intangible assets to be amortized ¥ 483,974,342 585,988,252
Technology | Minimum    
Intangible assets disclosures    
Intangible asset useful life 5 years  
Technology | Maximum    
Intangible assets disclosures    
Intangible asset useful life 10 years  
Others    
Intangible assets disclosures    
Intangible assets to be amortized ¥ 187,739,465 131,629,465
Less: accumulated amortization (95,069,619) (68,368,021)
Net book value - intangible assets to be amortized ¥ 92,669,846 ¥ 63,261,444
Others | Minimum    
Intangible assets disclosures    
Intangible asset useful life 3 years  
Others | Maximum    
Intangible assets disclosures    
Intangible asset useful life 10 years