Vegetable gum is modified natural plant high molecular compound material, with good rheological property . It can reduce the loss on sieve greatly and offer good sealing and blocking function to broken stratum,sandstone and absorbent formation. It can degrade automatically, and offer no pollution. It can be used in water-based slurry or drilling fluid without solid phase. It is gray white powder, its solution just likes glue and is not affected by electrolyte.