The cockpit and inlet play an important role for aircraft stealth performance. In order to analyze the scattering characteristics of cockpit and inlet, four kinds electromagnetic models with different components were established. The influence of RCS curve distribution, response of pitch angle and frequency were studied with Physical Optics method and relative value based on RCS mean. The results show that the scattering distribution is not changed by the cockpit and inlet with consideration of stealth design, and their distributions characteristics are similar. When the pitch angle increases, the RCS relative means of model C and D in nose, rear and circumferential directions increase oscillatorily, and relative means in lateral direction oscillate, and the biggest relative mean of model D in rear direction is 25.1942 dB with the pitch angle of 5 degree. When the frequency increases, the RCS relative means of model C and D in nose, rear and circumferential directions decrease oscillatorily, relative means in lateral direction increase gradually, and the biggest relative mean of model D in rear direction is 22.5722 dB with the frequency of 1GHz. The influence of cockpit on electromagnetic scattering is weak, and the relative value in nose direction is between -2.4 to 1 dB; while the inlet has greater impact on electromagnetic scattering, and the relative value in nose direction is between 2 to 12 dB.