Doubleelbow is an important component of highpressure manifold system used for hydraulic fracturing.The high pressure and large displacement liquidparticle twophase fracturing fluid can be forced to change direction many times through the doublebends,which makes the doublebends suffer serious erosion wear and flowinduced deformation.In order to improve the erosion wear state of pipe fitting,the influence of manifold structural parameters on erosion rate was studied.The computational fluid dynamics (CFD) numerical investigation was employed to conduct a comprehensive analysis of flow erosion,and flow induced deformation by the coupling of discrete phase model (DPM) and FSI methods.The effects of structural parameters such as connection straight pipe length,pipe inner diameter and fluid turning direction on erosion wear and flowinduced deformation were discussed.The results indicate that with the increase of connection straight pipe length,the flow erosion decreases first then varies little,but the deformation gradually increases.Considering the effect on erosion wear and structural deformation,the length of connection straight pipe should be designed to be 4 times the outer diameter of the pipe.Slight erosion wear but large structural deformation in major inner diameter pipe,therefore the inner diameter of the doubleelbow should not be too large or too small.The minimum degree of erosion and flowinduced deformation present with the fluid turning direction of doublebend as 0°.