Abstract: Plant glue drilling fluid plays an important role in drilling in pebbly sand, loosely and broken stratum for its good properties such as viscoelasticity, film build property and environment protection. With new type plant glue-KL plant plue drilling fluid as example, the origin, processing, amount and modification of KL plant glue were studied to make sure the optimized formulation. Its main properties were evaluated from funnel viscosity, filter loss, viscoelasticity, lubricity, stability and environment protection. In the end, the application situation of KL plant glue drilling fluid in the actual projects was introduced. Studies show that KL plant glue solid free environmental protection drilling fluid can be put into use in geological drilling engineering by its simple formulation, easy operation, good property and environment protection.