Aiming at solving the problem of poor availability of the physical parameters of a practical overhead crane，this thesis proposes
a parameter identification method based on energy reservation． It builds up regression equations for identification based on energy
reservation principle，and then applies non-negative least squares algorithm to deal with data，obtaining the controller design model of overhead
crane． This thesis has the identification experiments done on the overhead crane experimental system simulating the characteristics
of the operation of practical overhead crane and gets the mathematical model of the system． On the basis of the mathematical model，
an LQR controller has been designed to testify the accuracy of the identification results，confirming that the parameter identification
method can help a lot on control of overhead crane．