Abstract: A touch control pen assembly comprises a pen head including a touch head and the base; the touch head being placed in the base; one end of the touch head having a spring; a rear end of the touch head being formed with an annular groove for receiving the spring so as to form as the pen head; when the touch head being pressed downwards, the spring providing a buffer force to the touch head; and a pen shaft assembly connected to a rear end of the pen head for extending a length of the pen head so that a user can hold the pen conveniently. The pen head is detachable to be used with pen shaft assembly of different types. The spring at one end of the touch head will provides a buffer force for a pressed touch head so that the pen has uniform pointing forces.