Supplier quality evaluation method

The invention provides a supplier quality evaluation method, which comprises the following steps of: establishing a weight factor value matrix according to the severity and the influence degree of a supply product quality problem, and calculating a supply S-PPM value by utilizing a formula; calculating the after-sales S-PPM of the product according to a formula, and setting a score conversion algorithm of a supply S-PPM value to convert the supply S-PPM value into a value under a 100-score system; setting a score conversion algorithm of the after-sales S-PPM value, and converting the after-sales S-PPM value into a numerical value under a 100-score system; setting score deduction items and corresponding score deduction numerical values according to audit and check discovers, and removing the score deduction items under a 100-score system to obtain a quality assurance capability score of the product; and setting a first weight number for the supply S-PPM, setting a second weight number for the after-sales S-PPM