Abstract:After a 5-year (1982-1986) experiment on the planting of Populus×xiaozhuanica cv ‘popularis‘ in different time (planting once every 5 days during the month of April) in the dry-irrigated area in Dengkou county, the result shows that the most appropriate planting time is from 5-15 April. The effect of planting will be unsatisfactory, if it is planted after the date of 20 April. The differences for each item for planting in different times are as follows:1. Populus×Xiaozhuanica cv ‘popularis‘ has acquired a property of sprouting, so that if it is planted earlier or later, the survival rate from 97% to 77%, the preserving rate from 95% to 74% respectively. However, there is no significant difference between them. But the different periods to carry out the planting has a very significant influence on the variation of sprouting rate (4.0-62.0%).2. The yield of wood volume per hectare for early planting (1-10 April) is 12.8-6.9m~3, whereas for later planting (20—30 April) is only 3.8-0.9m~3.3. It is important to handle the proper time for planting. We take the start of blossoming time of apricot as the forecast of the end of planting.