## PP-Structure Upgrade Considerations
Since its launch in 2021, the PP-Structure series models have undergone three generations of updates and iterations. Currently, the latest version is the third generation (PP-StructureV3). All the code and documentation on this page are based on the second generation (PP-StructureV2). **This directory will be removed at an appropriate time in the future, and maintenance for the second generation will be discontinued.**
The third generation, PP-StructureV3, offers more powerful document analysis capabilities, and we strongly recommend users to use this version via the integrated wheel package. For a detailed introduction to PP-StructureV3, please refer to the [PP-StructureV3 Introduction Document](https://www.paddleocr.ai/latest/en/version3.x/algorithm/PP-StructureV3/PP-StructureV3.html); for specific usage instructions, please see the [PP-StructureV3 Usage Guide](https://www.paddleocr.ai/latest/en/version3.x/pipeline_usage/PP-StructureV3.html).
In addition, we will discontinue maintenance of the KIE capability provided in the second generation. We recommend that you use the PP-ChatOCRv4 model in PaddleOCR 3.x, which offers more accurate key information extraction. For a detailed introduction to PP-ChatOCRv4, please refer to the [PP-ChatOCRv4 Introduction Document](https://www.paddleocr.ai/latest/en/version3.x/algorithm/PP-ChatOCRv4/PP-ChatOCRv4.html); for specific usage instructions, please see the [PP-ChatOCRv4 Usage Document](https://www.paddleocr.ai/latest/en/version3.x/pipeline_usage/PP-ChatOCRv4.html).
## PP-Structure 升级事项
PP-Structure 系列模型自 2021 年推出以来，已经历三代版本的更新迭代。目前，最新版本为第三代（PP-StructureV3）。本页面的所有代码与文档均基于第二代（PP-StructureV2），**后续将在适当时机删除本目录，并停止对第二代的维护。**
第三代 PP-StructureV3 提供了更为强大的文档解析能力，我们更推荐用户通过集成 wheel 包来使用该版本。关于 PP-StructureV3 的详细介绍，请参考[PP-StructureV3 介绍文档](https://www.paddleocr.ai/latest/version3.x/algorithm/PP-StructureV3/PP-StructureV3.html)；具体的使用方法可参见[PP-StructureV3 使用文档](https://www.paddleocr.ai/latest/version3.x/pipeline_usage/PP-StructureV3.html)。
另外，在第二代提供的 KIE 能力，我们也将停止维护，推荐大家使用 PaddleOCR 3.x 版本的 PP-ChatOCRv4 模型方案，关键信息抽取更准确。关于 PP-ChatOCRv4 的详细介绍，请参考[PP-ChatOCRv4 介绍文档](https://www.paddleocr.ai/latest/version3.x/algorithm/PP-ChatOCRv4/PP-ChatOCRv4.html)；具体的使用方法可参见[PP-ChatOCRv4 使用文档](https://www.paddleocr.ai/latest/version3.x/pipeline_usage/PP-ChatOCRv4.html)。