A computer-implemented method for adjusting a 3D model of a target monitored area, wherein the method comprises: fusing a 2D video of the target monitored area and the 3D model of the target monitored area to generate a mesh model (S 101); the method being characterized in that, determining whether each set plane in the mesh model is even based on a stored location of a respective reference plane in the 3D model; when there is an uneven set plane, referred to as a target set plane, in the mesh model, for each target set plane, selecting an uneven point in the target set plane as a mark point, and generating a virtual plane that passes through the mark point and is parallel to a reference plane corresponding to the target set plane (S 104); and adding the virtual plane to the 3D model, and for the 2D video, saving the 3D model in which the virtual plane is added; wherein fusing the 2D video of the target monitored area and the 3D model of the target monitored area to generate the mesh model comprises: obtaining a 2D image of the 3D model of the target monitored area and a correspondence between the 2D image and depth information; replacing the 2D image with a video image in the 2D video of the target monitored area; and adding the depth information to the replaced 2D image based on the correspondence between the 2D image and the depth information to generate the mesh model; wherein determining whether each set plane in the mesh model is even based on a stored location of a respective reference plane in the 3D model (S 103), comprises: determining a reference plane corresponding to each of set planes based on a stored correspondence between the set planes and reference planes; for each set plane, determining whether a distance from each point in the set plane to the reference plane corresponding to the set plane is greater than a first threshold, and if so, determining this point as an uneven point; and determining whether the number of uneven points on the set plane is greater than a second threshold, and if so, determining that the set plane is uneven. fusing a 2D video of the target monitored area and the 3D model of the target monitored area to generate a mesh model (S 101); the method being characterized in that, determining whether each set plane in the mesh model is even based on a stored location of a respective reference plane in the 3D model; when there is an uneven set plane, referred to as a target set plane, in the mesh model, for each target set plane, selecting an uneven point in the target set plane as a mark point, and generating a virtual plane that passes through the mark point and is parallel to a reference plane corresponding to the target set plane (S 104); and adding the virtual plane to the 3D model, and for the 2D video, saving the 3D model in which the virtual plane is added; wherein fusing the 2D video of the target monitored area and the 3D model of the target monitored area to generate the mesh model comprises: obtaining a 2D image of the 3D model of the target monitored area and a correspondence between the 2D image and depth information; replacing the 2D image with a video image in the 2D video of the target monitored area; and adding the depth information to the replaced 2D image based on the correspondence between the 2D image and the depth information to generate the mesh model; obtaining a 2D image of the 3D model of the target monitored area and a correspondence between the 2D image and depth information; replacing the 2D image with a video image in the 2D video of the target monitored area; and adding the depth information to the replaced 2D image based on the correspondence between the 2D image and the depth information to generate the mesh model; wherein determining whether each set plane in the mesh model is even based on a stored location of a respective reference plane in the 3D model (S 103), comprises: determining a reference plane corresponding to each of set planes based on a stored correspondence between the set planes and reference planes; for each set plane, determining whether a distance from each point in the set plane to the reference plane corresponding to the set plane is greater than a first threshold, and if so, determining this point as an uneven point; and determining whether the number of uneven points on the set plane is greater than a second threshold, and if so, determining that the set plane is uneven. determining a reference plane corresponding to each of set planes based on a stored correspondence between the set planes and reference planes; for each set plane, determining whether a distance from each point in the set plane to the reference plane corresponding to the set plane is greater than a first threshold, and if so, determining this point as an uneven point; and determining whether the number of uneven points on the set plane is greater than a second threshold, and if so, determining that the set plane is uneven.