Top-working may be one of successful methods used for changing one variety toan other when walnuttrees don't produce sufficienty ield. Top-working application that enable store place unproductive or poorquality walnut varieties with better quality ones is a simple, easy andreliable operation for growers. Therefore, it can make more efficient the walnut orchards in Moldovia. Seedlingwalnuttreesthatdon’tyield in thewalnutorchards can be alsobroughtintoproduction. Top-working can therefore contribute to walnut cultivation in Moldovia. Grafting methods such as ‘bark graft’ and ‘modified bark graft’ can be operated on the main branches with 40-50 cm trunk diameter of 5-10years with 100-150 years old walnut trees or seedling trees. In these methods, the trunk or main branches can be grafted with cross-cut above 2-3 m from the level for walnut seedling trees. After the trunk of tree is cut for xylem exudation two weeks before grafting in early spring, the grafting application is done in late March when air temperature reaches to 20-25 0C. The suitable temperatures for walnut top-working coincide with in early April in Moldovia. The shoots should be taken in January, February and March, and stored at 4 0C in the refrigerator until grafting season. A graft master can averagely make 15 pcs of top-working in a day depending on the age and location of tree. The graft take is usually resulted in high success rates. The grafted trees begin to yield a few years later, and tree yields are closer to their peers within 5-7 years.