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This study aims to improve the quality of citrus cv. Siam through fertilization and pruning. This experiment used factorial randomized block design consisting of 2 factors. The first factor is fertilization consisting of 3 levels (P0 = only fertilized with manure/control, P1 = manure,N,P,K,Ca, and P2 = manure,N,P,K,Ca,Zn,Cu). The second treatment is pruning consisting of 3 levels (M0 =without pruning, M1 =pruning young shoots, and M2 =pruning young shoots, leaves and twigs that are protected and affected by disease). Fertilization treatment with P2 improved fruit quality, which was reflected by the increase of harvested fruit weight per tree (99.79%); weight per fruit (35.69%) and total dissolved solids (30.22%). Harvested fruit weight, weight per fruit, and total dissolved solids on treatment with P2 were 3442.76g, 173.58g, and 9.48obrix, respectively, but on control that were only 1673.13g; 127.92g and 7.28obrix. In the pruning treatment, the best results were obtained in M2 which was reflected in the increase in weight of fruit harvested per tree (40.91%), weight per fruit (19.56%) and total dissolved solids (25.55%). Fruit weight per tree, weight per fruit, and total dissolved solids in M2 treatment were 3638.77g, 173.58g, and 9.63obrix respectively, but in controls only 2582.34g, 145.92g, and 7.67obrix