invite spouse, please help with visa application!

Hi Dear. I'm Azizbek Nurmirzayev. In China, My studying will continue until July 10, 2016 that's why if I send to my spouse invitation letters with my passport, what kind will be given to her by PRC Embassy in Uzbekistan, Tashkent? My spouse is going to come on December 15. In this case, will the Embassy in Uzbekistan give to her for 7 months or after coming to PRC, will my spouse get extended in PRC? Please answer completely to my questions. Thank you for your answers!