Physical parameters on polyimide (PI) surfaces were investigated via spectroscopic techniques as a function of ROLLER ROTATION SPEED and STAGE MOVING SPEED of a rubbing process. The observed parameters exhibited the following trends; the parameters, such as anchoring energy and induced anisotropy, were enhanced as ROLLER ROTATION SPEED and STAGE MOVING SPEED increased until an optimal condition was reached. However, the parameters reversely degraded as those increased over optimal value of treating condition. From Raman spectroscopic measurements, we confirmed that strongly rubbing-treated PI over optimal condition was chemically degraded, resulting in degrading the parameters of PI.