The structure of channel conversion unit is designed with the basal element of null gate,and its input-output relationship is given. By utilizing channel conversion units,the two-input-four-output explosive logic circuit is constructed，in which the structure and input-output relationship are given,and its logic function is tested too. The results show that the designed two-input-four-output ELC is reasonable in structure,and it is easy to achieve its function compared to two-input-three-output ELC constructed by destruction crossovers. With this result,more complicated multi-input-multi-output ELC can be constructed and used in aiming warhead to increase the brisance.