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FAIR VALUE MEASUREMENT (Details) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | ---
Fair value measurement |  |  |  |
Short-term investment | $ 4,323,492,324 | ¥ 28,129,938,110 |  | ¥ 14,112,862,288
Available-for-sale investments |  | 18,552,440,485 |  | 14,467,476,607
Measured on recurring basis |  |  |  |
Fair value measurement |  |  |  |
Total | 7,007,539,787 | 45,593,156,115 | $ 4,269,069,801 | 29,640,151,624
Measured on recurring basis | Financial products |  |  |  |
Fair value measurement |  |  |  |
Short-term investment | 4,133,182,123 | 26,891,722,845 | 1,211,910,189 | 8,414,292,445
Measured on recurring basis | Time deposits |  |  |  |
Fair value measurement |  |  |  |
Short-term investment | 22,899,772 | 148,992,785 | 973,409,560 | 6,758,382,572
Measured on recurring basis | Listed equity securities |  |  |  |
Fair value measurement |  |  |  |
Available-for-sale investments | 1,911,255,506 | 12,435,201,698 | 1,103,540,314 | 7,661,880,397
Measured on recurring basis | Unlisted debt securities |  |  |  |
Fair value measurement |  |  |  |
Available-for-sale investments | $ 940,202,386 | 6,117,238,787 | $ 980,209,738 | 6,805,596,210
Measured on recurring basis | Level 1 |  |  |  |
Fair value measurement |  |  |  |
Total |  | 12,435,201,698 |  | 7,661,880,397
Measured on recurring basis | Level 1 | Listed equity securities |  |  |  |
Fair value measurement |  |  |  |
Available-for-sale investments |  | 12,435,201,698 |  | 7,661,880,397
Measured on recurring basis | Level 2 |  |  |  |
Fair value measurement |  |  |  |
Short-term investment |  | 27,450,451,246 |  | 15,172,675,017
Measured on recurring basis | Level 2 | Financial products |  |  |  |
Fair value measurement |  |  |  |
Short-term investment |  | 26,891,722,845 |  | 8,414,292,445
Measured on recurring basis | Level 2 | Time deposits |  |  |  |
Fair value measurement |  |  |  |
Short-term investment |  | 148,992,785 |  | 6,758,382,572
Measured on recurring basis | Level 2 | Unlisted debt securities |  |  |  |
Fair value measurement |  |  |  |
Available-for-sale investments |  | 409,735,616 |  |
Measured on recurring basis | Level 3 |  |  |  |
Fair value measurement |  |  |  |
Total |  | 5,707,503,171 |  | 6,805,596,210
Measured on recurring basis | Level 3 | Unlisted debt securities |  |  |  |
Fair value measurement |  |  |  |
Available-for-sale investments |  | ¥ 5,707,503,171 |  | ¥ 6,805,596,210

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