Abstract: Block geometrical morphological analysis is essential in application of block theory to rock engineering. Up to now the research on block morphological analysis is seldom found in public literatures. By characterizing and classifying different types of concave zone within concave block, the rules to judge the of existence of intersections of every 3 faces according to different types of concave zone is established. By analyzing connecting relations of intersections and calculating areas of block faces and volume of block, The morphological analysis methods of complex block are developed, which can be used to construct and visualize located blocks in tunnel and slope and to analyze the complex block in application of block theory to practical rock engineering, and can be referred in the similar researches.