To make Dragon Boat Festival posters in Photoshop, you can follow the following steps:

1. Select background: First, open Photoshop and create a new canvas. Choose a background color related to Dragon Boat Festival, such as green or blue, as the background. You can use the gradient tool to create a natural background effect.

2. Add images: import images related to the Dragon Boat Festival, such as zongzi, dragon boat and mugwort leaf. Use the moving tool to place them in the appropriate position.

3. Text design: Use text tools to add titles and descriptions. Choose an appropriate font and size to ensure that the text is clearly visible. Consider using different colors and styles to increase the visual effect.

4. Adjust the layer: Use the layer panel to adjust the transparency and blending mode of images and text. You can try different settings until you achieve satisfactory results.

5. Add special effects: If necessary, you can add some special effects to enhance the attraction of the poster. For example, you can use filters to add some artistic effects, or use layer styles to create shadows, glow and other effects.

6. Save and output: After the poster design is completed, you can select "File" > Save to save it in PSD format for later modification. If necessary, you can also select File >; Export exports it to JPEG or other formats for printing or sharing.