您好raiden1234，

Hi raiden1234,

感谢您在此发帖。

我们建议你
升级 TFS 2013至TFS 2017 首先，然后下载
团队基础服务器到Visual Studio团队服务迁移指南和数据库导入工具。然后按照指南将TFS迁移到VSTS。

We recommend you upgrade TFS 2013 to TFS 2017 first, then download the Team Foundation Server to Visual Studio Team Services Migration Guide and Database Import Tooling. Then follow the guide to migrate TFS to VSTS.

对于自定义工作项和自定义字段，TFS和VSTS之间存在一些差异，您可以在VSTS中重新自定义它们或导入TFS中的定义但有一些限制。请参阅

有关详细信息，请参阅TFS和团队服务之间的功能差异。

For the custom work items and custom fields, there are some differences between TFS and VSTS, you can re-customize them in VSTS or import the definitions as in TFS but with some limits. Please see Feature differences between TFS and Team Services for details.

您还可以尝试
OpsHub Visual Studio Online Migration Utility ，它旨在迁移版本控制变更集，工作项等的历史记录。

You can also have a try for the OpsHub Visual Studio Online Migration Utility, it’s designed to migrate history of version control changesets, work items etc.

参考：
https://blogs.msdn.microsoft.com/visualstudioalm/2016/11/16/import-your-tfs-database-into-visual-studio-team-services/
 

最诚挚的问候。