The dielectric tunable Ba0.6Sr0.4TiO3-Ba4Ti13O30 (BST-BT4/13) composite ceramics with high dielectric phase contents and good temperature stability have been prepared by the solidstate reaction method. The effects of Ba4Ti13O30contents and sintering temperatures on the microstructure, dielectric and tuning properties were investigated. Results show that the increase of BT4/13 content is beneficial to the improvement of sintering properties, the decrease of dielectric constant and the enhancement of temperature stability of BST-BT4/13 composite ceramics, but it will reduce the tuning rate of BST-BT4/13 composite ceramics. With the increase of sintering temperature, the dielectric constant of BST-BT4/13 composite ceramics increases. As the volume fraction of BT4/13 phase reaches as high as 92%, the BST-BT4/13 composite ceramics have excellent temperature stability at 20~160 ℃ and its dielectric constant maintains almost unchanged at 20~65 ℃, and still exhibits obvious dielectric nonlinearity with the tunability of 1% at a DC bias field strength of 10 kV/cm.