Http://windows.microsoft.com/zh-cn/windows-10/cortanas-regions-and-languages
For Windows Ten Currently,
Cortana is only available in the following countries/regions: China, France, Germany, Italy, Spain, Britain and America, and United States. Cortana is available in these languages:chinese (simplified), 中文版 (U.K.), 中文版 (U.S.), French, Italian, German, an D Spanish. to use Cortana, all these settings must is set to the same language:
Following are the necessary and sufficient conditions for Cortana to function properly
languages (This is your device language)
Speech language
Country or region
note:if Your region, you might is not being able to shop at the Store, or use things you ' ve purchased, like memberships and subscriptions, games, movies, TV, and music.
Update (8/5/15)-A fix is released as part of a cumulative Update for Windows 10:august 5, for A problem Cortan A was experiencing when installing language packs. If your settings is aligned as described above but you still can ' t use Cortana, installing the latest Windows Updates mig HT fix the problem.
Cortana fails after installing a language pack | Solve