Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China
; CCAST, World Lab, Beijing 100080, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
According to our recent studies, we derive a new mass formula for strange quarks at zero temperature. We apply it to investigating the properties of strange quark matter and obtain similar results to those in the MIT bag model. A different point in our results is that the variation of sound velocity with energy density becomes a little slower.