In order to achieve accurate measurement of two-dimensional acceleration, based on the capacitance of variable pole distance flat capacitors and variable area cylindrical capacitors considering edge effects, computer numerical simulation is used to study the output characteristics of dual differential flat capacitive accelerometers and differential cylindrical capacitive angular displacement sensors considering edge effects. The numerical simulation results show that the optimized output characteristics of the dual differential flat capacitive accelerometer and differential variable area capacitive angular displacement sensor can achieve sensitivities of 2.15 and 45 pF/rad, respectively, and both have good linearity; When calculating edge effects, the measurement errors of these two sensors can be reduced. For the geometric dimensions and measurement range of the sensors given in the article, the maximum absolute error reduction can reach about 1 and 0.075 rad, respectively. A two-dimensional dual differential capacitive accelerometer is formed by combining a dual differential flat capacitive accelerometer and a differential cylindrical capacitive angular displacement sensor. This accelerometer has the advantages of simple structure and high measurement accuracy, and can be used to measure linear motion and axial rolling.