How to brush in ai and how to set pressure to achieve calligraphy effect.

Press the B key to switch to the brush tool first, then click the "Bottom Triangle" in the brush tip list in the tool property bar above, click the "New Brush Tip" button to pop up the "New Brush" dialog box, click "OK" to pop up the "Calligraphy Brush Options" dialog box, adjust the size of the "Diameter" below, then change the right side to "Pressure", and then change the most. Click "OK" at this time!

With graphics tablet, you can use the brush tool to draw strokes with different thicknesses in AI!