This　paper　begins　with　a　discussion　of　the　role　and　value　of　industrial　control　system　(ICS)　testbed　which　apply　a　universal,　controllable,　realistic,　and　repeatable　experimental　platform　to　SCADA　control　system　cybersecurity　research.　According　to　ICS　layered　architecture,　ICS　testbed　based　on　emulation,　physical,　and　simulation　(EPS-ICS　Testbed)　is　designed　and　implemented.　EPS-ICS　Testbed　enables　experimenters　to　create　experiments　with　varying　levels　of　fidelity　and　is　widely　used　in　vulnerability　digging,　comprehensive　security　training,　facilitate　development　of　security　standards,　develop　advanced　control　system　architectures　and　technologies　that　are　more　secure　and　robust.