in the income statement, operating income includes main business income and other business income.

when analyzing the operating income, we should focus on the main business income, because the main business income is the income obtained from the main business projects of the enterprise, which is a recurring income, and generally has the characteristics of continuous regeneration. For example, the main business income of a beverage enterprise is the beverage sales income, so the main business income is of great significance to decision-making. By analyzing the proportion of main business income in operating income, we can see the level of business sustainability of enterprises.