Immune colloidal gold technique (colloidal gold enhanced immunochronmtography assay, CGEIA) is using colloidal gold as tracer marker of antigen antibody binding reaction a classical immune marker technique in lateral immunochromatography technology products (lateral flow device, LFD) is more common. Its core lies in the specific binding reaction of antigen antibody and the specific adsorption of colloidal gold particles. 1971 by Faulk and Taytor invention, introduced in China in 90s, currently in HBsAg, HCG, HIV, syphilis and other diseases have been very mature diagnosis. At present, the technology is widely used in the detection of chemical residues and animal disease diagnosis.