1. label: On the label, different grades of red wine will have different labels. For example, French red wine, the AOC cocktail party will mark "AOC" on the wine label, not "clamation d' Origin contrlée".

2. Appearance of wine bottle: Generally speaking, the appearance of high-grade red wine bottles will be more exquisite, while ordinary wine bottles are relatively simple.

3. Grape varieties: High-grade red wine will be marked with clear grape varieties, which have strict requirements on the origin and quality of grapes.

4. Taste and smell: The taste and smell of high-grade red wine are usually more delicate, complex and layered, while ordinary wine is relatively single.

5. Price: Generally speaking, the price of high-grade red wine will be higher.

It should be noted that the above methods can only preliminarily judge the grade of red wine, and the real determination of the grade of red wine needs to be combined with various information such as winery, year and producing area.