Is SAXY J1808.4-3658 a strange star?

The possibility of strange stars is one of the most important issues in the study of compact objects. Here we use the observations of the newly discov ered millisecond x-ray pulsar SAX J1808.4-3658 to constrain the radius of t he compact star. Comparing the mass-radius relation of SAX J1808.4-3658 wit h theoretical models for both neutron stars and strange stars, we argue tha t a strange star model could be more consistent with SAX J1808.4-3658, and suggest that it is a likely strange star candidate. Our results are useful in constraining microscopic chiral symmetry restoration parameters in the q uantum chromodynamics (QCD) modeling of strange matter.