Abstract: Using widely distributed and cheap wild vegetable gums,we developed a LG vegetable gum additive.The paper introduced the physical and chemical performance of LG gum and its effects in fresh water,salt water and complex salt water drilling fluid systems first.The results of soak test,shale expansion test and shale’s rolled recovery showed the good rejection capability and anti-collapsing.Result of lubrication test showed that reduced rate of lubrication factor of 4% LG vegetable gum in slurry was 57.9%.It can resist 100℃.Then the active mechanism of viscosifying action,loss control and lubrication of LG gum was elaborated.Finally,the author introduced its application performance in no-dig and coal field drilling engineering.The lab test and field application have shown that LG gum is a good viscosity increaser,fluid loss additive,salt-resisting agent,anti-caving agent and lubricant,also because it comes from the leaves of camphor section plant,it has a promising future.