The total area of tangerines Sen of the Luc Yen district in 2012 was 48.6 hectares, accounting for 12.4 percent of citrus fruit total area. Sen's tangerine specialties likely grow well in the ecological conditions of Luc Yen district, but due to lack of research on the biological characteristics of agriculture as the basis for the application of technical measures suitable work should not bring high economic efficiency for the gardener. Pruning techniques have a positive impact on the growth buds, increase fruit set, yield tangerine Sen. Yield increased from 11.3 to 13.5 kg fruit/plant, equivalent to 15.89 to 18.98 percent compared with the control to nature.