There are obvious regional differences in the utilization efficiency of agroclimatic resources for the cereals yield in the world. The comprehensive utilization efficiency for the cereal yield in Europe is the greatest,which is 2. 78. Next it is 1.43 in North America and Oceania, 1.40 in Asia, and 1.12 in South America.In Africa it is the lowest, which is only 0. 61. The relative light energy utilization efficiency (%) is from 0. 03 (in Angola) to 0. 76(in Netherland). The Heat utilization efficiency (kg.℃-. ha-) is from 0. 03 to 2. 03 (in Netherland and Sweden). The precipitation utilization efficiency (kg. mm-1. ha-1 )is from 0. 35 (in Angola) to 8. 71 (in Netherland). The transfer efficiency of cereals is high in regions where the conditions of light,heat and precipitation cooperate relatively well with the crop demand (see Table 1-4). On the other hand,the moisture is easy to exert efficiency in dry and Semi-dry regions.Therefore the potential utilization efficiency of agroclimatic resources in the world is very great. In China,the utilization efficiency of agroclimatic resources is lowrer than that in countries with high yield mainly because of the low utilization efficiency of the unit area preduction. So to rise the utilization efficiency of agroclimatic resources of the unit area preduction will become an important task in the future.