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v3.24.1

Accounts receivable, net (Details) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | ---
Credit Loss [Abstract] |  |  |
Accounts receivable | $ 2,037,586 | ¥ 14,431,613 | ¥ 85,215,404
Less: allowance for doubtful accounts | (647,886) | (4,588,786) | (4,862,941)
Accounts receivable, net | $ 1,389,700 | ¥ 9,842,827 | ¥ 80,352,463

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