With 20 % short carbon fiber reinforced PEEK as the main raw materials， the air inlet and samples were prepared by the iniection-moulding method. The mechanical properties and microscopic morphology of samples， X-CT nondestructive testing and three coordinates testing of the air inlet were analyzed. Experimental results show that the tensile strength of PEEK composites reaches 208 MPa， tensile modulus reaches 16.7 GPa， punch-type shear strength reaches 100 MPa， the distribution of irregular fiber is even， the inner defects of inlet are low， both inner and outer contour of inlet are smooth， size precision is higher。