Foreign priority, also known as "foreign priority", means that the patent applicant filed a patent application in China within 12 months from the date when he first filed a patent application for an invention or utility model with the same theme in a foreign country, or filed a patent application in China within 6 months from the date when he first filed a patent application for a design with the same theme in a foreign country, and the date when he first filed a patent application in a foreign country is the priority date.
Simply put, the domestic priority is that you applied before, but your writing is not good, giving you a chance to start again. The application date is still calculated according to the previous one, but the scope cannot exceed the previous one.
Foreign priority means that foreigners have applied for patents abroad before, and when they come to China to apply, as long as the priority period does not exceed, the application date is calculated according to the time when they applied abroad.