In order to study the high quality factor Q based on the bound state in the continuum (BIC), a terahertz all-dielectric metasurface composed of double hollow silicon cylinders was proposed. The transmission spectrum and electromagnetic field diagrams of the structure were simulated and analyzed. The eigenmode analysis was used to study the influence of the metasurface structure parameters on the BIC frequency, and a BIC metasurface working in a large terahertz frequency range was desigined. The results show that an adjustable high-Q toroidal dipole Fano resonance is realized at around 3.0THz. The results of symmetry mismatch between the eigenmode analysis calculation and the incident electromagnetic wave mode. The analysis indicate that the metasurface supports a symmetry-protected BIC. This research provides a theoretical reference for the application of high-Q metamaterials based on BIC in the fields of ultra-low threshold laser devices, nonlinear optical harmonic generation, and high-sensitivity sensing.