Pumping-conveyed plug and perforation combination is one of the most commonly used techniques for horizontal well staged fracturing. The drillable composite bridge plug, the key tool of the technology, has the risk of hard to be drilled out when multi-stage use or casing deformation. Thus, the soluble fracturing plug is developed without being drilled, which can save time, cost and reduce risk. The composition, working principle, advantages and key parameters of two popular dissolvable fracturing bridge plugs are expounded. The design principles and suggestions are put forward for the key mechanism, such as the design of small outer diameter and anti-misoperation setting mechanism to ensure RIH successfully, adopting two-way slips or one-way slip with self-locking design to ensure plug sitting, adopting the design of PAWL and shear pin to ensure plug being threw away, and using soluble metal and rubber to guarantee to be dissolved. The main body of slip is made of soluble metal, coated with nickel-based alloy or inlaid with high hardness ceramic or hard alloy anchor teeth to solve the contradiction between anchoring and dissolving. Compared with other kinds of bridge plug, that provides a reference for the design of downhole tools such as bridge Plug.