The paper is organized as follows. In Section 2, we introduce our sample GCs and their observational
CMDs. In Section 3, we summarize the features of the theoretical CMDs of stellar populations.
In Section 4, we present the binary fittings of the CMDs of star clusters and show the properties of
the GCs. In Section 5, we compare the results determined respectively by binary- and single-star
populations. Finally, in Sections 6 and 7, we give our discussion and conclusions.