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建窑足底，除了普通足底外，还有少量的刻款或印款的足底。“供御”底款最为常见的是贡品铭文，多为直接刻写于足底内，作阴文整体，通常都是楷书，也有模印于垫饼上，作阳文反体。

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在窑址中，还发现了不少“供御”款的垫饼，说明当时除了刻款，还有印款的。但是，在底款残片中，我们却很少发现有“供御”的印款。可能有这样的一种原因，相比刻款，印款的字体更为、工整、漂亮（当时会读书、写字，有书法功底的工匠，肯定是非常非常少的），专门上贡官府的窑口可能多是采用印款，而相比其他窑口，这些窑口技术水平要高，残次品较少。或者，由于其实专门的官府指定窑口，其生产出来的次品也不可随意外流，需指定销毁，因此在现在常见的窑址中，很少发现“供御”印款残片，而只见“供御”垫饼。

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鉴别建盏底款不能一概而论，主要还是应该把握当时的时代气息。真款无论书法好坏、刀法如何，自然不拘是他们的共性。仿款无论怎样熟练，在这一点上总脱离不了拘谨之气。