Abstract: The problems of vertical-tail configuration for the space shuttle orbiter are discussed. Through studying the criteria for vertical-tail configurations and the situations of the ready-made space shuttle orbiters or the conceptual layouts of the second generation space transportation system, there are three modes for the vertical-tail configurations of the orbiter can be obtained, and the important measures to improve the lateral-directional stability characteristics can be imposed. These results can provide some helpful informations for designers concerning aerodynamic configuratiops and the preliminary design of the orbiter.