This paper introduces a method of merging systolic messy arrays. A systolic messy array features data-triggered PEs placed in various directions in a 2-dimensional lattice plane. The two kinds of merging are described as Shared-array and Interlacing-array. A shared-array is a systolic messy array where at least two systolic messy arrays share portions of their arrays and the data on the portions is shared with all systolic messy arrays. An interlacing-array is a systolic messy array where at least two systolic messy arrays share portions of their arrays but where the data on the portions is not shared. The data on the portions flows independently so that an interlacing-array can deal with each of its own calculations without interference. Several examples of the two kinds of merging are presented and their construction methods are illustrated.