or providing a ridged portion 48 to allow skewing the fastened strength of the ground fixing portion 46 to the ground can be improved while not illustrated in the diagrams even when installed on extremely rough terrain entire lifting of a mat can be prevented by enabling a degree of skewing in the connecting portions to summarize the description thus far on installation of the grass protection mat according to the present invention with the ground fixing portions 46 of ground anchoring means 40 that are disposed at each corner of the peripheral frame of a single mat 1 in fig1 or a group of single mats constituting a mat assembly 1 u2032 in close proximity to the green g and the mats arranged the mat anchoring members 100 a 100 b or 100 u2032 are inserted simultaneously through the holes 44 of the ground fixing portions of adjacent mats and planted in the ground thus allowing installation of the mats while preventing lifting or deformation thereof here with a plurality of mats connected with hooking means and installed anchoring members are passed through the corners thereof and planted in the ground to complete installation the anchoring members 100 a 100 b and 100 u2032 according to embodiments of the present invention as illustrated in fig4 a are only representative examples and other forms of mat anchoring members may be used such as columns that are passed through the holes 44 of the ground fixing portion 46 and planted in the ground combined with plates of a predetermined area at.