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In order to study the effect of solid–liquid two-phase abrasive flow on the surface of inner wall of the special-shaped cavity and relationship between finishing parameters and surface quality, the process of abrasive flow finishing non-linear pipe is numerically simulated. Taking the T tube as the research object, the inlet pressure and outlet pressure change, and abrasive viscosity and other factors were maintained. Then, a test scheme is designed by orthogonal test, which verifies the correctness of the simulation. The T-pipe inner surface roughness is measured, according to the roughness data; the contribution of process parameters to finishing quality is analyzed using Six Sigma Theory. By analyzing the experimental data, optimum technology parameters and regression equation of surface roughness degree with volume fraction, which can be used to guide the abrasive flow actual finishing, are obtained, and it is found that the simulating results are identical with the test results.