GTD-MOM techniques are studied, the physical model basis is put up by GTD-MOM techniques ,and the far scattered field and radar cross section of a fine perfect conduction cylinders is calculated using this method. The currents on the cylinder consist of three components: the current induced by the incident field and the reflected currents from the cylinder terminations. In comparison with MOM of total domain basis ,this method consumes much less memory and time, and the results of this method are in good agreement with those of MOM.