  Binary stars are common and it is necessary to model stellar populations
using binary stars. We introduce a method to model binary-star stellar
populations quickly. The method can also be used to model single-star stellar
populations. The method is called rapid stellar population synthesis and it is
based on a statistical isochrone database of both single- and bianry-star
stellar populations. The database can be obtained easily from the CDS (or on
request to the authors) and can be used conveniently for most stellar
population studies and colour-magnitude fits. The main feature of using such a
technique for modeling stellar populations is that it can save much computing
time. Comparing to the method which evolves binary-stars using stellar
evolution codes directly, the rapid stellar population synthesis method takes
only one of 200,000 of the computing time. Although we can use the database to
model stellar populations quickly, the involved uncertainties in spectra
synthesis is small ($\sim$ 0.8%). I also introduce the method that uses the
spectral energy distributions (SEDs) of single stellar populations to model the
SEDs of composite populations.
