This invention is about the electric connector and its processing technique. More specifically, it involves terminals with puncture structure, electric connector and their processing technique. The processing technique herein includes stamping terminal processing, winding displacement processing, injection upper cover, injecting lower cover, piercing processing, removal of material ribbon, front glue chip assembly, assembly of outer metal shell. Among them, the upper cover and lower cover are injected and molded in the middle and rear of the corresponding terminals in array. The processing technique has tackled the problems as unstable contact, poor contact, high electric resistance and micromation which cannot be solved by the current existing electric connector. There should be at least two tusks whose tips are intertwined molded in the electric connector of piercing terminal. The tusks are the pyramid shape with a cambered surface in the inner side; it reduces the electric resistance of electric connector. The upper and lower covers of piercing HDMI electric connector are respectively molded in the arrayed terminals. The rear end of the terminal has molded piercing tusk. The electric connector has become smaller and lighter, improving its performance in every aspect significantly.