EU Blue Cards are issued by EU member states to third-country nationals. The holder of an EU Blue Card is entitled to take up residence in the EU for the purpose of taking up gainful employment.
或者from wiki:
The Blue Card is an approved EU-wide work permit (Council Directive 2009/50/EC)[1] allowing high-skilled non-EU citizens to work and live in any country within the European Union, excluding Denmark and Ireland, which are not subject to the proposal.[
1. After eighteen months of legal residence in the first Member State as an EU Blue Card holder, the person concerned and his family members may move to a Member State other than the first Member State for the purpose of highly qualified employment under the conditions set out in this Article.
2. As soon as possible and no later than one month after entering the territory of the second Member State, the EU Blue Card holder and/or his employer shall present an application for an EU Blue Card to the competent authority of that Member State and present all the documents proving the fulfilment of the conditions set out in Article 5 for the second Member State. The second Member State may decide, in accordance with national law, not to allow the applicant to work until the positive decision on the application has been taken by its....
3. The application may also be presented to the competent authorities of the second Member State while the EU Blue Card holder is still residing in the territory of the first Member State.