Abstract: It is aimed at exploring the water injection nozzle which is characterized by large flow area and high pressure loss in limited space, so as to ensure water allocation accuracy and good anti-blocking capacity in the process of water flooding recovery. The TRIZ innovation theory was applied to perform thorough analysis and optimal design on separate layer water injection nozzle which has the performance of high pressure loss anti-blocking. Based on function and collision matrix analysis, the water nozzle was structurally optimized by means of the structure nesting method, and a novel bypass reverse water nozzle with the nesting form was designed. And its pressure loss characteristic was analyzed by using numerical simulation. It is indicated that this novel water nozzle is superior to the traditional Ø2.0 mm straight hole nozzle in term of pressure loss characteristic while its cross section area is remained larger (not smaller than the flow area of traditional Ø4.0 mm straight hole). And thus, the anti-blocking capacity of the water nozzle is improved and its maintenance free cycle is extended while the accuracy of water allocation is guaranteed.