Modified from ISO standard sea container. Based on in-house modification, floor & wall & roof can all be modified to get good force resistance, heat insulation, sound insulation, moisture resistance; tidy and clean appearance, and easy maintenance. Delivery can be completely built-up, both water pipe system and electrical system could be well installed, ready to hook-up local supply system. Take you no time to assemble it. Just get it, put it on the flat ground, then use it. (Both water tie-in and electrical tie-in prepared, which would make it very easy to hook-up local system.) The out surface and inner fittings could be dealed with as your own design. Enable compounding of individual containers in longitudinal and transverse directions without limits. It also enables compounding of containers in 4 floors in height.