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Short-term investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Cash and Cash Equivalents [Abstract] |
Schedule of short term investments consist |
Schedule of short term investments consist |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
Marketable securities |  |  | 18,411,162 |  |  |  | 149,583,000 |  |  |  | 20,808,942 |
Fair value disclosure:
|  |  |  |  | December 31, 2023 |
|  | December 31, |  |  | Fair Value |
|  | 2023 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Marketable securities |  |  | 18,411,162 |  |  |  | 18,411,162 |  |  |  | - |  |  |  | - |
|  |  |  |  | December 31, 2024 |
|  | December 31, |  |  | Fair Value |
|  | 2024 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Marketable securities |  |  | 149,583,000 |  |  |  | 149,583,000 |  |  |  | - |  |  |  | - |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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