Locating the critical point of QCD phase transition by finite-size scaling

It is pointed out that in relativistic heavy ion collisions, critical related observable in the vicinity of critical point should follow finite-size scaling.The methods of finding and locating critical point are established for the first time by finite-size scaling and its critical characteristics, in particular, the fixed-point and straight-line behavior.As an application of the method, the critical behavior at RHIC data is demonstrated.