AliExpress banner image requirements are as follows:

Size requirements: It is recommended to use a size of 1920 pixels wide x 600 pixels high to adapt to different devices and screen sizes.

Image quality: Ensure that the image is clear and high-quality, and avoid blur, distortion or pixelation.

Eye-catching: Design attractive visual effects, use bright colors, attractive pictures and text to attract users' attention.

Concise and clear: The information should be concise and clear, avoid too much text and complex patterns, and highlight the main promotional information or product features.

Brand consistency: Stay consistent with the brand image, use brand logos, fonts and colors and other elements to enhance brand recognition.

Adapt to multiple platforms: Ensure that the banner image can be displayed normally on different devices, including computers, mobile phones and tablets.

Standard requirements: Follow the standard requirements of AliExpress, do not contain content that violates laws and regulations or infringes on copyright, and do not involve sensitive or inappropriate topics.

Please note that the above are general banner image design requirements. Specific requirements may change according to AliExpress updates. It is recommended to check AliExpress's official guidelines or requirements before designing to obtain the latest information.