[Aim] The invasive sycamore lace bug, Corythucha ciliata, has caused great harm to Chinese urban sycamore trees, especially to Platanus acerifolia, sometimes causing the death of weak host trees. Investigation to the pest post-overwintering habit under the bark of the host trees is essential to discover more effective control measures during winter seasons.[Method] During mid-March 2017, the damaged sycamore trees were carefully surveyed to assess the population density of the lace bug in Xinxiang, Henan, China. The pest populations were compared between shady and sunny sides of the host trunk, or among four different tree height classes (0.00-0.50 m; 0.51-1.00 m; 1.01-1.5 m; 1.51-2.00 m), and among six classes of number of bark cracks (<5%, 5%-25%, 25%-50%, 50%-75%, 75%-95% and > 95%).[Result] Pest population density under the host bark on the sunny side was statistically higher than that on the shady side[(F=6.63>F_0.01(1,19)=1.0132, P<0.001)]. Trunk height within 1-1.5 m had the highest population density, with a mean of 11.5[(F=26.91>F_0.01(3,56)=4.1519, P<0.001)]. The number of cracks of the bark was also an influential factor for overwintering. The mean pest population density under the bark of trees of 1-1.5 m and 50%-75% of cracks reached 9.8, which was significantly higher than with other classes of cracks on the bark[(F=31.02>F_0.01(3,56)=4.1519, P<0.001)]. The interaction of tree height and bark crack intensity also significantly influenced the pest population density[(F=2.46>F_0.05(9,56)=2.0519, P=0.0195)].[Conclusion] In Northern China, preventive measures with white lime water on the bark of host trees was more effective when applied in early or mid-December and on trees of 1.0-2.0 m after the crawl down of these pests. The result of this study implies more effective and economic control measures in winter season can be considered in the process of strategy for this serious pest in urban sycamore trees.