Abstract: Honeycombs with unique shapes are widely distributed on rock outcrops and stone buildings in different regions. The study of honeycombs is of great significance to the deep understanding of rock weathering mechanism, which has been a hot issue in Geomorphology Research for many years. Honeycombs have wide spatial development, different morphologies and bedrock properties, leading to previous studies proposing different genetic explanations, which are controversial. Previous studies mostly focused on sandstone and conglomerate area, but there are few reports on the study of honeycombs on metamorphic rocks strongly affected by tectonic activity. A large number of elliptical honeycombs with diameters of several centimeters are developed on the fractured rhyolite of Heipaijiao Rocky Beach, Huidong County, Guangdong Province. In this paper, three-dimensional scanner is used to scan the morphological characteristics of 782 caves in typical areas, to establish three-dimensional models, restore their morphology with high precision, quantify the morphology and distribution of caves, and discuss their control factors and formation processes. The results show that the diameter of honeycombs hole is mostly below 10-15 cm; The depth is mostly below 3 cm. The oblateness of the portal is relatively large (mainly between 0.15 and 0.6), and its shape is mainly elliptical and extremely elliptical, controlled by the development of joint fissures and foliation. The dominant factor in the early development of honeycombs is salt weathering. Under the microscope, the rudiments of holes in the rock can be seen. When the expansion of the cave causes the surface minerals or rock fragments to fall off and form pits, the cave is gradually eroded and eroded by seawater, and salt weathering and sea erosion ntly promote the development of the cave. In the later stage, the thin wall between caves was broken, and the caves gradually penetrated each other. After a certain scale is formed, the interior will be used as a new plane for the next development cycle. 

Key words: honeycombs, coast, salt weathering, cleavage rhyolite, three-dimensional scanning model