1. Open PS and click "File on Menu Bar" to create a new blank document. The document size and size unit are defined according to actual needs.

2. Select the background image, click "File", select "Open", and select the appropriate background image to import into PS.

3. Select "Move Tool", click "File on Menu Bar", move the picture to the document interface currently being edited, select "Free Transform" in "Edit", adjust the position and size of the picture, and press "Enter" to complete the adjustment.

4. Add another picture, select the picture and drag it into the canvas, and press Enter to finish adding. Right-click the new layer 2 and select Rasterized Layer.

5. Add filters, select Filter Library in Filters, pop up the option box, adjust the view size, select the required filters, and adjust the parameters.

6. select a layer effect, click "normal", select the desired layer effect, and use the shortcut key CTRL+T to adjust the position and size of the picture.

7. Add a mask, click Add Vector Mask in the lower right corner, select Eraser Tool, and adjust the brush effect to "Soft Edge Machine" to reduce the transparency of the brush and make a gradient effect.

8. Add text, press the left mouse button at a suitable position on the canvas to pull out the text editing box, add text for the poster, select all the text, adjust the text by using the "character option box", and finally add an effect to the text layer.