1, Theme and Content: First of all, we need to determine what the theme and content of the documentary is, whether it is an introduction to the history, culture, humanities, nature and economy of Northeast China or a record of a specific event, person or story. Documentary titles can be named according to the theme and content, such as Northeast History and Culture and Northeast in Snow.

2. Features and highlights: There are many unique cultural, historical and natural landscapes in Northeast China. If some unique features and highlights can be highlighted in the documentary, they can also be reflected in the title of the film, such as "The Ice and Snow World in Northeast China" and "The Food Journey in Northeast China".

3. Expression technique and style: The theme of the documentary can also be selected according to the expression technique and style, such as "The Adventures of the Northeast Wild" and "The Story of the Northeast People".