C-X-C motif chemokine 16 （CXCL16） is a chemokine of the intercrine alpha family which is a 9.8 kDa protein containing 88 amino acid residues. In mediate the innate immunity, CXCL16 is a chemotaxis for T cells and NKT cells, which expressed the CXC chemokine receptor （CXCR） 6. CXCL16 also can be enhanced the expression level by the TNFα, IL-1 and IFNγ. CXCL16 protects the host by against the gram positive and gram negitive bactreials.