Plant breeders realize that, up to now, there are only two effective ways to in-crease the yield potential of crops through breeding, i.e. morphologic improvementand heterosis utilization. However, the potential is very limited by using morphologicimprovement alone, and heterosis breeding will produce undesirable results if it doesnot combine with morphologic improvement. Any other hreeding approaches andmethods including high technology like molecular breeding must he incorporated in-to good morphologic characters and strong heterosis, otherwise there will be no actu-al contributions to yield increase. On the other hand, the further development ofplant breeding for high target must rely on the progress of biotechnology. Plant breeders realize that, up to now, there are only two effective ways to in-crease the yield potential of crops through breeding, ie, morphologic improvement and heterosis utilization. However, the potential is very limited by using morphologic simplifications alone, and heterosis breeding will produce any other hiring method andmethods including high technology like molecular breeding must he incorporated in-to good morphologic characters and strong heterosis, there there will be no actu-al contributions to yield increase. On the other hand, the further development ofplant breeding for high target must rely on the progress of biotechnology.