The most critical and striking indicator of marketing activities is ROI (Return on Investment), that is, the ratio between the income generated through activities and the cost of activities. Return on investment is an important indicator to measure the effect of marketing activities, which can reflect the impact of marketing activities on corporate profits. In addition to ROI, the following are some other factors that can be used as key indicators of marketing activities: Number of participants: The number of participants can reflect the attractiveness and promotion scope of marketing activities. Conversion rate: conversion rate refers to the ratio of actual sales obtained through marketing activities and is an important indicator to evaluate the success of activities. Cost-benefit ratio: this indicator is used to calculate the ratio between the total cost of marketing activities and the total income, which can help enterprises determine whether it is worth investing. Feedback and satisfaction: collect user feedback and satisfaction feedback through surveys and questionnaires, so as to improve and optimize marketing strategies. When choosing a key indicator, you need to consider your business goals and what results you want from the marketing activities. According to different factors such as activity type, industry and target audience, choose the key indicators that suit you, so as to judge whether the effect of marketing activities is in line with expectations.