| Schedule of property and equipment |
| | | | | | | As of December 31, | | | 2024 | | 2025 | | | RMB | | RMB | Furniture | | 399,918,776 | | 516,646,489 | Machinery and equipment | | 232,110,473 | | 274,038,907 | Building | | 152,378,097 | | 154,577,570 | Office and electronic equipment | | 34,892,580 | | 34,408,262 | Leasehold improvement | | 10,878,525 | | 11,524,486 | Motor vehicles | | 3,775,545 | | 4,451,537 | Property, plant and equipment | | 833,953,996 | | 995,647,251 | | | | | | Less: Accumulated depreciation | | (513,940,364) | | (575,474,216) | | | | | | Property, plant and equipment, net | | 320,013,632 | | 420,173,035 |
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| Schedule of depreciation expense on property and equipment allocated to expense items |
| | | | | | | | | For the Year Ended December 31, | | | 2023 | | 2024 | | 2025 | | | RMB | | RMB | | RMB | Cost of revenues | | 26,811,275 | | 32,342,412 | | 38,373,759 | Selling and marketing expenses | | 107,996,726 | | 78,589,848 | | 62,465,700 | Research and development expenses | | 3,641,514 | | 3,847,241 | | 3,982,199 | General and administrative expenses | | 9,057,825 | | 7,101,034 | | 5,871,696 | | | | | | | | Total depreciation expense | | 147,507,340 | | 121,880,535 | | 110,693,354 |
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