The production materials are different: Mayonnaise consists of edible vegetable oil, vinegar, fruit juice, egg yolk, protein, salt, sugar, vanilla, chemical seasoning, sour flavor and other raw materials. Egg yolk salad dressing: one egg yolk, 250ml colorless and tasteless vegetable oil, 25g white vinegar, 25g white sugar and 0.5g salt. Mayonnaise, the main raw materials of salad oil and egg yolk.