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ACCOUNTS RECEIVABLE, NET - Summary (Details)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
ACCOUNTS RECEIVABLE, NET          
Accounts receivable ¥ 263,994,880   ¥ 329,336,616    
Allowance for doubtful accounts (169,038,710)   (29,593,693) ¥ (4,549,366) ¥ (3,307,381)
Accounts receivable, net ¥ 94,956,170 $ 13,374,297 ¥ 299,742,923