1. Both images were opened with PS. Adjust the picture to the appropriate position and size, so that layer 1 and layer 2 appear in the layers panel.

2. Click on the bottom right to add a mask to the picture, which actually plays an important role in the synthesis of two pictures.

3. Select the gradient tool in the left toolbar, and set the top to linear gradient, with black foreground color and white background color, as shown in the red box below.

4. From right to left, pull the gradient, select a suitable position to pull the gradient, and make a linear gradient to make the seams of the two pictures disappear.

5. Finally, the final fused effect diagram is obtained.