Abstract: An acidizing fluid for improving reservior permeability was developed by application of reservior lithology,oil field chemistry and drilling technology,which greatly increased success of reservior modification and daily product of single well.It showed that the fluid have successfully been applied to different reserviors in Zhuangxi,Fanjia,Shenghai areas and gained big benefit.There is a bright prospeet for application of acidizing fluid to various reserviors of non marine complex oil province.