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v3.24.1

Summary of significant accounting policies (Details 1) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | ---
Total non-controlling interests | $ 14,187 | ¥ 86,196 | ¥ 291,921
Ocean H K [Member] |  |  |
Total non-controlling interests | $ 14,187 | ¥ 86,196 | ¥ 291,921

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