| In this research, the parental inbred lines of some widely spread maize hybrids and location materials were planted in solution culture. Then the seeding plant height, root length, Zn accumulation, Zn use efficiency in different maize inbred lines were tested to analyze the genotypic differences. Ten maize inbred lines were selected to conduct a diallel cross, to examine the combining ability of plant height and root length of maize offspring. Then the genetic analysis was used to get the good parents and high Zn efficiency combinations. The results showed: (1) The genotypic differences of Zn nutrition in maize inbred lines were significant. The seedlingplant height, root length, dry matter accumulation were close related with Zn nutrition. (2) The plant height, root length and dry weight were tested at the range of Zn concentration which was 010-6mol/L. The Zn concentration that the plant grows worst was 10-9mol/L. The suitable Zn concentration to maize growth was 10-7mol/L. The maize growth wasn't accelerated by continuing increase the Zn concentration. This treatment's effect was only a little higher than the Zn deficiency. The plant height and dry weight were both lower in 10-9mol/L than in 0. This result showed that the harm was more severe in lower Zn content than Zn deficiency.(3) The effect of the different Zn concentration to maize growth was different. The Zn concentration has obvious effect on the growth of stems and leaves, and no significant effect on root.(4) The differences of Zn uptake and utilization efficiency among maize inbred line genotypes were significant. The maize inbred lines were classified on biomass. The efficient and sensitivity maize inbred lines genotypes were Nongxi 110, Luyuan 92, Qi 319, Xing K 36 etc. The efficient efficient maize inbred lines which are Ji 853, Chang 7-2 has a high Zn uptake efficiency. The nonefficient maize inbred lines such as 212, 543, Nongxi 531 etc has a high Zn use efficiency. They can normally grow in lower Zn concentration. The nonefficient-nonefficient maize inbred lines were 97-1, SN-1 letc.(5) In this research, the results showed that the locational material are mostly efficient-nonefficient and nonefficient-nonefficient types. They aren't sensitive to Zn effect. They can normally grow at not only high Zn concentration but also low Zn concentration.(6) The analysis of the diallel cross showed that the general combining ability and specific combining ability variance of plant height and root length were very significant. Theinheritance of the trait was determined by inheritance variance. The inbred line Liyuan 92's general combining abilities of plant height and root length were higher than other inbred lines at lower Zn concentration. The efficient inbred lines might not be the good parents. Luyuan 92 XZi33O has stronger heterosis at plant height. Nongxi 110xSN-ll has stronger heterosis at root length. These two combinations might be the Zn efficient combination. The cross combinations of Zn efficient inbred line parents' specific combining ability might not high.
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