In order to solve the irrationality problem of equal weighing in grey decision-making, the paper put forward synthesized and integration weighing method. Adding the decision maker’s inclination into the process of weighing making by using subjective method and uniting subjectivity and objectivity, this method compares with another two-subjective and objective weighing making. Result indicates that synthesized and integration weighing method can solve the uniting problem of subjective and objective during the decision making process, and an even more satisfactory effect can be achieved by this method.