A chip of fiber optical trap was investigated, using the Vgrooved SiO2 platform to align the fibers and the piezoelectric components to break the constraints between particles and the substrate. After successfully trapping the particle with 10 μm diameter in the air, the axial fluctuation of the particle reaches to the submicron scale (0.12 μm). Furthermore, combined with the micromachining technology, this paper realizes a sealed microcavity to contain few particles that not merely achieves integration into labonachip environments but also implements the reproducible launching of a single particle, promoting the application for engineering of optical trap sensing technique.