Based on femtosecond transient absorption spectroscopy, the charge carrier dynamics ofCdSxSe1−x nanocrystal doped glasses was investigated by analyzing the nonlinear differential transientabsorption spectra. Time constants were extracted, which are different from the literatureresults using similar samples: they are pump laser intensity-dependent and decreasewith increasing pump laser intensity, whereas risetime constants are pump laserintensity-independent and high-order exciton recombination can be identified from thespectra. The threshold pump intensity was determined, which is lower than the literatureresult. Reasons for high-order recombination were analyzed, and broad size, statedistribution and high pump intensity are found as key factors. Auger recombination mayplay a key role in the multi-exciton recombination. Theoretical calculations andanalysis support this conclusion. A schematic model for electron transport and theformation of triexcitons in our samples are proposed to explain these results.