The invention provides 
a DNA (Deoxyribonucleic Acid) probe 
library used for hybridization with a 
KRAS gene. The 
DNA probe 
library comprises one or more 
DNA probes which can be hybridized with the 
KRAS gene, wherein the 
DNA probes include the following sequences: SEQ ID NO.1, SEQ ID NO.2, SEQ ID NO.3, SEQ ID NO.4, SEQ ID NO.5, SEQ ID NO.6, SEQ ID NO.7, SEQ ID NO.8, SEQ ID NO.9 or SEQ ID NO. 10. The invention further provides a method for enriching the 
KRAS gene segments by adopting the DNA probe 
library. Based on this, the invention further provides a method for detecting gene structure mutations of the KRAS gene. The method disclosed by the invention can be adopted to obtain the KRAS gene segments by enriching in thousands of times, and the KRAS gene segments can be used for a next generation sequencing technology to detect the gene structure mutations including single base 
mutation, mRNA deletion or increase, mRNA structure 
transversion and mRNA splicing change.