Abstract: Luonan-luanchuan fault is an important boundary of dividing the southern margin of NC block and North Qinling. Oolitelime of Cambrian Zhangxia group emerged widely in Loucun area north beyond the fault and oolite deformation is widely developed. By studying deformed oolite in the microcosmic way, on the base of underst anding the macroscopic deformed mechanism and structure evolution sequence, the ratioamong the three axis (X:Y:Z) and Flinn parameters (K) can be calculated and the character of oolite deformation can be known. It is indicated that oolite deformation is charact erized by monad compression (0