Under certain conditions,shallow water waves may interact with offshore breakwaters in the form of solitary wave.In view of this phenomenon,the analytical integral solution to the reflected and transmitted solitary wave field caused by finite thickness vertical porous breakwater under action of oblique solitary wave is derived by applying the eigenfunction expansion approach,and solitary wave forces on breakwater and solitary reflected or transmitted wave surfaces are accordingly calculated，which have certain theoretical as well as application value.The results show that the variations of incidence wave angle,sea condition,breakwater surface porous coefficient and solitary wave characteristic parameter may have some influence on wave effects.Compared with Airy small amplitude wave theory under the same shallow water condition,the predicted values of wave load and the maximum wave surface of the solitary wave theory are significantly larger,reflecting the nonlinear effect of the shallow water wave.At the same time,it shows that the solitary wave model will be more reasonable and reliable under certain shallow water conditions.