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In temperate and subtropical climates, <i>Populus deltoides</i> is an important poplar species. To analyze the stability, adaptability, and high yield of <i>P. deltoides</i> hybrid genotypes in East China, 38 <i>P. deltoides</i> genotypes were screened at three experimental sites in Shandong Province, and the coefficients of variation and genetic characteristics of 5-year growth were examined using BLUP-GGE. Results showed that all coefficients of variance were higher for diameter at breast height (DBH) than for tree height at all sites; the repeatability and heritability of tree height were greater than those of DBH at all sites. The fitting degree of tree height and DBH was 93.72% and 92.22%, respectively. The optimum genotype varied by location and grouping, of which Shanxian County divisions are the most powerful and representative of the three sites. The growth of 5-year-old <i>P. deltoides</i> was highly varied because of hereditary factors. Shanxian County is the more appropriate site for growth of <i>P. deltoides</i> in the tested sites in East China. In East China, genotypes 16, 5, 21, and 7 are regarded as superior. The genotypes 8, 26, and 36 are better for the site Rizhao; 16, 5, and 21 for site Shanxian; and 22, 21, and 5 for site Boxing.