Seeing from spaceflight remote image, for example Google Earth, the author found that the macrokarstification is strongly controlled by regional large "X" conjugate joint system. This kind of joints act as passage for the leak down of meteoric water from the surface, and at the same time, makes the carbonate nearby dissolved. As a result, the karst landscape appears a "X" solution valley network in horizontal strata area, and a featherlike one in vertical strata area respectively. When the water leak down to the undergroundwater level, it will flow horizontally along the joints to the local base level of erosion to form a "X" network system of underground conduit in horizontal stratum area， but it is relative complex，because of the joining of other joints. The authors believe that this regular pattern will be helpful the research of soil erosion and desertification, and the groundwater searching in karst area.