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PROPERTY, PLANT AND EQUIPMENT, NET - Depreciation expense (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
PROPERTY, PLANT AND EQUIPMENT, NET.      
Depreciation expense ¥ 147,507,340 ¥ 140,771,102 ¥ 93,600,898
Cost of revenues      
PROPERTY, PLANT AND EQUIPMENT, NET.      
Depreciation expense 26,811,275 23,554,266 19,702,392
General and administrative expenses      
PROPERTY, PLANT AND EQUIPMENT, NET.      
Depreciation expense 9,057,825 8,113,535 7,856,968
Selling and marketing expenses      
PROPERTY, PLANT AND EQUIPMENT, NET.      
Depreciation expense 107,996,726 104,721,594 62,949,248
Research and development expenses      
PROPERTY, PLANT AND EQUIPMENT, NET.      
Depreciation expense ¥ 3,641,514 ¥ 4,381,707 ¥ 3,092,290