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In view of the diversity of satellite forward link users' needs, a design method of composite waveform is proposed. On the basis of the first spread spectrum of the low power signal for special type of users at the receiving end, the second spread spectrum method is adopted to make the low power signal compounded with the conventional high power signal. The effect of waveform recombination on the transmission performance of each signal is minimized, and the compatibility of signals in the composite waveform is ensured. The method of generating and receiving composite waveform is designed, and the transmission performance of composite waveform is analyzed by establishing simulation system. When the power distribution ratio of the composite waveform is more than 6 dB, the performance loss of the high-power signal is less than 2 dB, and the transmission performance of each signal in the composite waveform is acceptable.