This tutorial focuses specifically on how to use the common parameters in Midjourney prompts, helping you turn “getting good images is just luck” into “controllable toward a target.” I’ll explain parameters like aspect ratio, style strength, and randomness using the most common scenarios, and provide copy-ready wording.
The basic structure of a prompt: describe the subject first, then add constraints
In Midjourney, it’s recommended to clearly write the subject and action first, then add the environment, lighting, lens, and materials, so the model can grasp the key points more easily. For example: “a girl reading in a coffee shop, natural light by the window, 35mm, shallow depth of field”—make the scene work first, then talk about style.
If you often get “too many elements, scattered composition,” reduce your keywords to 6–12 high-information terms and separate them with commas. Midjourney becomes more random with overly long, conflicting descriptions, especially before you add parameter constraints.
The most commonly used parameters: how to choose --ar, --stylize, and --chaos
Use --ar (aspect ratio) for composition ratio—for example, posters often use “--ar 2:3,” while landscape images can use “--ar 16:9.” Try to decide the ratio at the beginning; repeatedly changing the ratio later will reshuffle the composition logic.
Use --stylize (also written as --s) for style strength. The higher the value, the more it follows “Midjourney’s aesthetic”; the lower the value, the more obedient and realistic it becomes. For product shots, infographics, and other cases that need controllable details, you can start with “--s 50~150”; for more atmospheric illustrations, increase it further.
Use --chaos (also written as --c) for randomness. The higher it is, the more likely it will diverge into unexpected compositions. For brainstorming, use “--c 20~40”; for stable reproduction, lower it to “--c 0~10.” This is the key switch behind why many people feel Midjourney is “sometimes great, sometimes terrible.”
