At present, the tracers used in oil and gas fields are water-soluble tracers or gas tracers. After years of research, a new type of microparticle solid tracer has been developed and it has been managed to construct in tight sandstone oil reservoir of Changqing Oilfield,It marks the successful move from experiment to mine. The application of solid tracer in the development of oil and gas fields has a further prospect, especially for the quantitative description of the fracture opening between wells in in tight sandstone oil reservoir.