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Long-term investments (Tables) | 6 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Long-term investments |
Schedule of Long-term investments |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2024 |  |  | June 30, 2025 |  |  | June 30, 2025 |
|  | RMB |  |  | RMB |  |  | USD |
|  |  |  |  | (Unaudited) |  |  | (Unaudited) |
5.0% Investment in a company in mobile games industry |  |  | 600,000 |  |  |  | 600,000 |  |  |  | 83,815 |
5.0% Investment in a company in central processing advertising algorithm services |  |  | 600,000 |  |  |  | 600,000 |  |  |  | 83,815 |
Subtotal |  |  | 1,200,000 |  |  |  | 1,200,000 |  |  |  | 167,630 |
Less: Impairment loss |  |  | 1,102,938 |  |  |  | 1,102,938 |  |  |  | 154,072 |
Total |  |  | 97,062 |  |  |  | 97,062 |  |  |  | 13,559 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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