Harmless treatment of waste drilling fluid is an important job for us to implement the concept of green exploration. Through laboratory test analysis and site survey, the pollution characteristics of waste drilling fluid in different fields of geological drilling were studied, and also its basic properties and its influence on the environment were investigated. With waste drilling fluid from Well Xiangtaodi-2 as the subject of study, research was done on the destabilizing technology with optimization of the gel breaker and flocculant materials to obtain the basic formula for destabilization treatment. The experimental results showed that de-stabilization and flocculation can be achieved of the waste drilling fluid rapidly, and pollution indicators, such as COD, suspended solids, chroma, declined significantly; which can create favorable conditions for the next deep treatment to achieve harmless emissions.