Mango is the widely adapted fruit tree in the rainfed upland conditions, when the local cultivar, Kaew is most popular grown. The research aim to determine the ability of grafting Kaew scion on interstocks of three commercial cultivars, Kiew Sawoer, Nang Klangwan and Nam Dokmai and to evaluate the effects of cultivar and grafting position of interstocks on survival and growth of Kaew scions. The experiment was conducted in the nursery of Faculty of Agriculture, Chiang Mai University and farmer field at the Chom Tong Land Reform Project area, Doi Lor District, Chiang Mai Province. The cross-section of the grafted materials revealed that the callus of the interstocks originated from Kiew Sawoer and Nang Klangwan fused better with Kaew scion than those from Nam Dokmai at 60 days after grafting. When the Kaew scions were grafted on the main, secondary and tertiary branching positions of 9-10 year-old Kiew Sawoer and Nang Klangwan cultivars in farmer field, the survival and growth of the grafted scions were not different. However it would be more practical to graft on the secondary branches of the interstocks. The study concludes that it is possible to replace the unwanted mango trees by grafting the desirable Kaew scions on the secondary branches.