The purpose of this study is to examine the precipitation of apatite on titanium surface that is affected by surface modification. Apatite formation on implants is important in achieving a direct bonding to bone tissue, Titanium plates of 10×10×1 ㎜ in dimensions were polished sequentially from #240 to #1500 SiC paper and one surface of each specimen was received an additional polishing sequence through 0.1 ㎛ alumina paste and then ultrasonically washed with acetone and rinsed with deionized water. Specimens were chemically washed for 2 minute in a 1:1,5:6 (in vol%) mixture of 48% HF, 60% HNO₃ and distilled water. Specimens were sandblasted with 50 ㎛, 75 ㎛ and 125 ㎛ alumina powder and then chemically treated with a solution containing 5-M KOH at 60℃ for 24 hours, and subsequently heat-treated at 600℃ for 1 hour. All specimens were immersed in the simulated body fluid(SBF) with pH 7.4 at 36.5℃ for 7 days, and the surface were examined with SEM and EDX. The specimen surface after sandblasting and KOB treatment was formed micropores on rough surface. The precipitation of apatite on titanium was accelerated by the sandblasting with alumina and immersion in KOB solution. The precipitation of apatite was densified with the increase of particle size of alumina sandblasting, The Ca/P ratio of blasted specimen with 75 ㎛ alumina showed 1.67.