Encapsulated phase change materials(PCMs) have the potential application value in thermal protection of explosive components and thermoregulation of electronic devices. However, previously reported encapsulated PCMs with inorganic shell materials have a limitation of large particle size, brittleness and poor compatibility with organic polymer. In this study, a series of modified organosilica nanoencapsulated n-octadecane phase change materials were prepared by using interfacial hydrolysis/ polycondensation method of different organic silane precursors in miniemulsion. The chemical and crystallizing structure, morphology, phase change properties, and hydrophobicity of the shell materials were characterized by Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD), scanning electron microscopy(SEM), differential scanning calorimetry(DSC), and water contact angle(WCA) measurements, respectively. The results show that two kinds of organosilica nanocapsules with spherical and bowl shaped morphologies, sizes of 200-693 nm, melting enthalpy of 93.2-107.5 J·g^-1 and water contact angle(WCA) of capsule shell materials of 67°-155° can be obtained by changing the volume ratios of organic silane precursors. The regulation and control of hydrophilic, hydrophobic and super hydrophobic properties for surface may be realized. Moreover, these nanocapsules with organosilica shells are not easily broken under the effect of ultrasound, indicating that the mechanical properties are improved.