the sliding block 20 is provided with a circulating device 30 respectively so as to make the rollers not shown circulate in the sliding block 20 such that the sliding block 20 is able to move circularly along the rail 10 in this embodiment the sliding block 20 is further provided at both sides thereof with a self lubrication module 40 for lubricating the rolling members in the sliding block 20 fig2 is an assembly view of the sliding block equipped with the self lubrication system in accordance with the present invention wherein at least one recess 22 is defined at both sides of the sliding block 20 and located adjacent to threaded holes 21 for reception of the self lubrication module 40 an upper and a lower lubricating holes 221 222 corresponding to upper passage 23 and lower passage 24 respectively are defined in the recess 22 such that the rollers in the upper and the lower passages 23 24 can be lubricated by the self lubrication module 40 furthermore the self lubrication module 40 is mounted to the sliding block 20 using a tongue and groove method in this case engaging groove 223 is defined in the recess 22 for engaging with the tongue structure of the self lubrication module 40 fig3 is an exploded view of the lubrication module of linear guideway in accordance with the present invention fig4 is an assembly view of the lubrication module of linear guideway in accordance with the present invention wherein the self lubrication module generally comprises oil storage box not shown and oil bearing material 43 the oil storage box not shown is interiorly provided with an oil storage space and designed as having a front cover 41 and a.