The internal logic of I think therefore I am in metaphysics

I think therefore I am is a famous proposition in western philosophy, which is the start of Descartes´s metaphysics systems. This Archimedes type basis points has not only pried the theory gap of the real world, but also find the reasonable logic connections between I think and I am, which gives full scope to the rational flag and makes sufficient theoretical preparations for the later development and subversion of metaphysics.