A hinge is provided for a laptop computer. The hinge includes a first connector, a lining, a bush and a second connector. The first connector includes a root and a socket extended form the root. The lining is fit in the socket so that the lining cannot be rotated in the socket. The lining includes a positioning device disposed therein. The bush includes a positioning device engaged with the positioning device of the lining when the bush is inserted in the lining. Thus, the bush cannot be rotated in the lining. The second connector includes a shaft rotationally inserted in the bush and a plate extended from the shaft for connection to another portion of the laptop computer. Damping oil is provided between the bush and the shaft.