1. Choose a theme: When drawing for national defense education, you need to first determine the theme and content of the painting, such as air defense exercises, military science and technology, and so on.
2. Determine the composition: according to the theme and content of the picture, determine the position and proportion of each element in the picture to form a reasonable picture.
3. Choose colors: choose colors that match the painting theme, such as green, brown and gray for military themes and blue and red for air defense exercises.
4. Sketch: Sketch the outlines and lines of various elements in the painting with tools such as pencils or drawing software.
5. Coloring and daubing: Use tools such as pigments or drawing software to color and daub various elements in the painting, and pay attention to color matching and detail treatment.
6. Add details: After the painting is completed, you can add some details to highlight the theme and content, such as adding some text descriptions or drawing some special details.
7. Finishing work: Finally, finish and polish the painting to make it more perfect and complete the national defense education painting.