本文通过对主再选配合时最大产率原则分析，指出，最大产率原则与主选排矸量等因素有关。对于主再选配合，不能套用最大产率原则；对不符合该原则条件的主再选配合，只要合理安排其主选产物排放，仍可使再选机正常工作，从而使主再选精煤综合产率最大。 This paper analyzes the principle of maximum yield when the main re-selection and cooperation, pointed out that the principle of maximum yield and the main election of the amount of waste and other factors. For the main re-election with the principle of maximum yield can not be applied; do not meet the conditions of the main re-election match, as long as the reasonable arrangements for the discharge of the main election product, still can make the re-election machine to work properly, so that the main re-election of coal Comprehensive yield the largest.