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Hydroxyapatite (Ca10(PO4)6(OH)2: HAp) is widely used as biomaterials. Properties of Kulon Progo hydroxyapatite (KPHAp) derived from local materials Kulon Progo natural gypsum (KPNG) were investigated. Kulon Progo is the name of a district in Yogyakarta Indonesia. KPHAp powder was synthesized from KPNG with diammonium hydrogen phosphate [(NH4)2HPO4] via hydrothermal (microwave) method at 100oC for 30 minutes, then compacted and heated (sintering). The results of this study are as follows. The KPHAp has X-ray diffraction (XRD) and Fourier transforms infrared (FTIR) patterns are similar to HAp SRM 2910 and HAp 200. With increasing temperatures, density and diametral tensile strength (DTS) will increase. The sintering temperature at 1400oC presented the maximum value of density and DTS. The sintering temperature at 800oC and 1400oC presented the multiple phases of calcium phosphate. With increasing compaction value, density will increase, nevertheless DTS will decrease. The results of scanning electron microscopy (SEM) are also used for analyzing the microstructure of samples. From SEM indicated that the real sintering is at the temperature of 1400oC.