It is an issue that needs to be comprehensively considered to adopt brick membrane or wood mould for the formwork of the bearing platform. Relatively speaking, the cost of brick membrane will be higher, which is also related to the soil slope. If the soil of the slope is good and the soil slope is stable, brick membrane can be used to dig the width of the basement, just widen the width of the masonry brick wall; Using wooden patterns requires excavating the working surface outside the pile cap, and the working surface is generally 1M wide.