The treatment engineering of landslide hazard is a complicated system engineering. The selecting treatment scheme is influenced by many factors such as technology, economics, environment, and risk. The decision-making of treatment schemes of landslide hazard is a problem of comprehensive judgment with multi-hierarchy and multi-objective. The traditional analysis hierarchy process needs identity test. The traditional analysis hierarchy process is improved by means of optimal transfer matrix here. An improved hierarchy decision-making model for the treatment of landslide hazard is set up. The judgment matrix obtained by the method can naturally meet the requirement of identity, so the identity test is not necessary. At last, the method is applied to the treatment decision-making of the dangerous rock mass at the Slate Mountain, and its application is discussed in detail.