提出了一种在双马赫-曾德尔干涉仪量子保密通信系统上同时实现时间编码和相位编码的混合量子密钥分发方案.提出的方案将原来相位编码方案中丢弃的脉冲进行时间编码,因此成码率是原方案的二倍.系统同时获得时间编码密钥和相位编码密钥,既可以一组用于通信,另一组用于监视窃听,又可以将两组密钥组合成新密钥.系统具有良好的应用前景. A hybrid quantum key distribution scheme is proposed to realize both time coding and phase coding in a dual Mach-Zehnder interferometric quantum secure communication system. The proposed scheme time-encodes the impulsed pulses in the original phase coding scheme, The code rate is twice the original scheme.At the same time the system obtains the time code key and the phase code key, either for one group for communication, the other for monitoring eavesdropping, but also can be two groups of keys combined into a new key The system has good application prospects.