The productions of calcium hydroxyapatite (Hap) and Ti(IV)-doped Hap (TiHap) particles were examined by forced hydrolysis reaction of Ca(OH)₂-pyrophosphate (pp: P₂O₇⁴⁻) and Ca(OH)₂-pp-TiCl₄ mixed solutions under 100 and 140°C, respectively, and precipitated particles were characterized by various physicochemical techniques. The degree of hydrolysis of pp ions was remarkably improved and the yields of the precipitates by using the pp ions was increased rather than the tpp one. No particles were produced at higher concentration of pp ions. On the other hand, ellipsoidal aggregated and rod-like particles were produced at other concentration domains. The Hap particles produced were ellipsoidal secondary particles with ca. 210–240 nm in the particle length which were composed by aggregation of small primary single crystal particles with ca. 20–50 nm in length. The TiHap particles facilitated at atomic ratio of Ti/(Ca+Ti) [X_Ti] ≦ 0.20 were ellipsoidal secondary particles with ca. 240–380 nm in length composing by aggregation of small primary particles with ca. 30–100 nm in length, while they were changed to very fine particles with ca. 5–10 nm in diameter along with small amounts of large rod-like particles at X_Ti = 0.3. The highly crystallized pure TiHap particles were produced at X_Ti ≦ 0.15, while the Hap structure was almost disappear at X_Ti = 0.2. All the TiHap particles produced at X_Ti ≤ 0.2 were phosphorus deficient. The diffuse reflectance UV spectra of TiHap particles revealed that these particles have a UV absorption property, especially fabricated at X_Ti = 0.05. The highly crystallized TiHap particles (0.05 ≦ X_Ti ≦ 0.15) had also large specific surface area.