Abstract: As the HF (High-Frequency) ground wave radar requires high duty-cycle, echo-eclipse becomes a serious problem for short-range target. Complementary signals with double-pulse has zeros sidelobes, but in the case of echo-eclipse, which has very high sidelobes for the reason of complementary feature is destructed. To solve this problem, this paper proposes a sub-complementary signal, and by using modified Golay algorithm a novel complementary signal is got whose incomplete codes also has perfect pulse-compressed characteristic. Computer simulation and test show that this coding method has very low sidelobes in case of echo-eclipse, whose signal resolution is much higher than other codes.