The feature points of test curve reflect important information of the equipment under test. The feature points are important for test report. Previous method of artificial selecting points is well targeted. However, it is low efficiency and subjectivity. A method to safe people from colossal data selection is long-cherished wish to all operators. The proposed algorithm in this paper can simulate the artificial process of feature information extraction and adjust the size of selected features according to the needs of the user. At least 100 times efficiency will be increase than artificial process.