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PRINCIPAL ACCOUNTING POLICIES - Other income/ (expense) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Other income/ (expense) |  |  |  |
Gain on disposal of cost method investment (Note 8) |  | ¥ 1,374,462,407 | ¥ 149,066,258 |
Foreign exchange gains/(losses) |  | 468,671,832 | (557,995,284) | ¥ 12,638,982
Subsidy income |  | 263,538,347 | 220,631,285 | 199,418,778
Gain on disposal of available-for-sale investment (Note 8) | $ 6,140,402 | 39,951,298 | 140,651,759 |
Dividends from long-term investment |  | 46,550,230 | 48,911,066 |
Gain on disposal of a subsidiary | 1,754,052 | 11,412,387 |  |
Gain on deconsolidation of subsidiaries |  |  | 252,000 | 2,294,451,702
Impairments of cost method investments | (21,405,634) | (139,271,481) | (11,628,980) |
Impairments of available-for-sale investment | (41,760,725) | (271,707,804) | (36,357,902) |
Provision/impairment for an equity method investment (Note 8 and Note 13) | (148,685,890) | (967,395,005) |  |
Others |  | 52,785,926 | 19,621,511 | (25,529,632)
Total | $ 135,099,540 | ¥ 878,998,137 | ¥ (26,848,287) | ¥ 2,480,979,830

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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