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Intangible assets, net (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets, net |
Schedule of intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
Non-compete agreements |  |  | 5,886,401 |  |  |  | - |  |  |  | - |
Subtotal |  |  | 5,886,401 |  |  |  | - |  |  |  | - |
Less: accumulated amortization |  |  | (5,886,401 | ) |  |  | - |  |  |  | - |
Intangible assets, net* |  |  | - |  |  |  | - |  |  |  | - |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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