Abstract: This paper is focused on the problem of robust stabilizing of a class of uncertain linear time-delay systems via observer-based dynamic output feedback control law when the full states can not be measured. Systems under consideration are linear systems with timevarying states and control delays, and also contain time-varying unknown-but-bounded uncertain parameters. A sufficient condition for the robust output feedback stabilizabitity of the system is derived. The sufficient condition is transformed into a Linear Matrix Inequality (LMI) problem and the control law can be constructed by solving two LMIs.