The font is not clear，label
How do I set it up?
Can you elaborate a bit? Can you share a Sandcastle example (https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/) and/or a screenshot of the issue?
There is currently some ongoing work on using a new technique to get better text rendering: https://github.com/AnalyticalGraphicsInc/cesium/pull/7730