Recent historical records have revealed that sands containing appreciable amounts of fines are susceptible to liquefaction during earthquakes. This paper describes the results of an experimental study on the undrained cyclic behavior and liquefaction potential of a typical silty sand soil with non-plastic silt. The cyclic behavior was systematically investigated considering the effects of confining stress (σ'3 = 50 kPa to 200 kPa), cyclic stress ratio (CSR = 0.25 to 0.75) and relative density (Dr = 20% to 46 %) with constant frequency (f = 0.5 Hz) via stress-controlled isotropically consolidated undrained cyclic triaxial tests. The pore water pressure generation, cyclic strain, effective stress paths, and cyclic resistance are examined. The liquefaction potential was examined through the pore water pressure ratio (ru) approaching to 100% criteria (initial liquefaction) proposed by Seed & Lee (1966). The test results revealed that comparing at the same relative density, increasing the cyclic amplitude reduces the resistance for liquefaction for all tested stress levels (i.e. CSR levels). Similarly, for the same cyclic amplitude, increasing the relative density increases the liquefaction resistance. Furthermore, it is observed that cyclic resistance increases with increasing effective confining pressure