There are four kinds of templates commonly used in construction, including aluminum alloy template, wood template, steel template and plastic building template. Each has its own characteristics. Aluminum alloy formwork: high recycling times, light weight, convenient construction, and large investment at one time. Wood formwork: cheap, no limit on the number of wood formwork, easy to absorb water, less use, and wood consumption. Steel formwork: it can be reused for many times, with high maintenance cost and limited modulus. Plastic building formwork: small, easy to crack, moderate price, poor rigidity.