Abstract: This invention provides a multi-function cushion and its assemblies, which is made of a tough and flexible plastic cloth being soldered together with supersonic (or high frequency) wave heating means to form a suitable geometric shape. On the circumference, some lugs with assembling hole are furnished. After being filled with air or water, said cushion will become an air cushion or water cushion to be used on the water or the land; in addition, a plural number of said cushions may be assembled together with hook ring, or link and cord to form various shapes for many purposes.