In TV series, I always hear Emperor Guangxu calling Empress Dowager Cixi Emperor Ama. Why is this?

It's Manchu, Amar means father, and Emperor Amar is the father of the emperor.

The royal family in Qing Dynasty was mainly composed of Manchu, Mongolian and Han nationality, with Manchu playing a dominant role. The number and influence of Mongolian royal family members gradually decreased with the stability of the Qing Dynasty, and the people were in a subordinate position. (Note: Manchu is not equal to Manchu, and Han people are not equal to Han people. )

High frequency vocabulary. We know that "Grandma" and "Empress" are Manchu, and "Emperor" is from China. The so-called "grandmother" and "empress" are a combination of Manchu and Chinese. This title is only found in Puyi's My First Half Life. It should be noted that Puyi's Manchu language is only at the level of "hello", "thank you" and "goodbye", which have never appeared in the official records of the Qing Dynasty. There are many related arguments, so I won't repeat them here. The real name of the meaning of "Huang Ama" should be "Khan Ama", which is the Chinese translation of Huang, and Khan Ama is a pure Manchu.