Abstract: The wall thickness uniformity of single point incremental forming (SPIF) of 5083 aluminium alloy was studied for parts with variable angle surface. Firstly, the data of part model was acquired by three-dimensional scanner, the forming trajectory was optimized by UG NX software, and then the finite element model was established to analyze the influence of number of feed layers, diameter of forming tool head,feed rate and spindle speed on the wall thickness uniformity of part. According to the results of finite element analysis, orthogonal test factors were selected for machine tool machining test. Finally, the test results were analyzed by range. The most significant influence of the four process parameters on the wall thickness uniformity was the number of feed layers and the least significant was the spindle speed of the machine tool. The optimum combination of process parameters for optimizing the distribution of part wall thickness was obtained by sequencing the influence of process parameters on the wall thickness uniformityof the part. The results showed that the maximum deviation of wall thickness between the numerical simulation model and the actual test results and the scanned data was 1.898% and 1.679%. The optimal combination of process parameters can optimize the wall thickness uniformity of the parts to 84.67%.