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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2024
Credit Loss [Abstract] |
Schedule of accounts receivable, net |
Schedule of accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
Accounts receivable |  |  | 26,963,149 |  |  |  | 23,714,517 |  |  |  | 3,298,998 |
Less: allowance of credit losses |  |  | (3,951,391 | ) |  |  | - |  |  |  | - |
Accounts receivable, net |  |  | 23,011,758 |  |  |  | 23,714,517 |  |  |  | 3,298,998 |
Schedule of changes in allowance for doubtful accounts |
Schedule of changes in allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
Beginning balance |  |  | 8,487,562 |  |  |  | 3,951,391 |  |  |  | 549,690 |
Addition |  |  | 3,951,391 |  |  |  | - |  |  |  | - |
Recovery |  |  | - |  |  |  | (3,951,391 | ) |  |  | (549,690 | )
Deconsolidation of Fe-da and subsidiaries |  |  | (8,487,562 | ) |  |  | - |  |  |  | - |
Ending balance |  |  | 3,951,391 |  |  |  | - |  |  |  | - |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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