1. A quality evaluation method for a single crystal ingot including steps of determining cropping and sampling positions and evaluating sample quality, wherein the step of determining cropping and sampling positions comprises: (a) inputting basic information on the decision of cropping, sampling and prime positions according to equipments and products; (b) predetermining the cropping, sampling and prime positions according to the basic information; (c) monitoring a growing process of an ingot and analyzing/storing an X factor related with the growth of the ingot; and (d) determining the cropping and sampling positions based on the basic information and the X factor.