Abstract: With the increasing complexity of drilling geological conditions and progressive developments in new drilling technologies,requirements for cement technology have increasingly notable and problems related with cement job quality have also been highlighted.This paper presents some methods to improve cement quality after analyzing influential factors of cement job quality;meanwhile,the paper does some research on the fiber cement slurry system and analyzes the mechanism of improving cement job quality.The results show that:the alter of volumetric shrinkage decreases with the increase of fiber content added in cement,the maximum relative volumetric shrinkage decreases by 38.3%.The adding of fiber can improve the alter of interface cementing strength effectively,and there exists an optimum amount of fiber added.Under this experimental condition,the optimum content of fiber ranges from 0.05% to 0.075%.