The method for determing fixed points LBRT proposed by Kadanoff et al. is found not perfect legal. We then propose a new procedure to obtain fixed points. The numerical calculations in two-dimensional Ising model are performed and found of little difference with Kadanoff's method. The reason has explained. In addition,, the new procedure is easier in pratical numerical work.
Chinese Journal of Physics=中國物理學刊 17(2), pp.107-109