A statistical analysis on earth tide triggered earthquake activity in the Kashi-Wuqia intersection area is studied on the basis of Schuster's test and Permutation test on daily and monthly scale． The north-south，east-west component of the tidal force and tidal body stress are chosen as the tidal curve in daily scale． The results show that the earthquakes occurred more near the maximum 0° of the three kinds of tidal curve，and the predominant tidal phases of the earthquake are － 5. 86°，6. 60° and － 15. 52°，and the frequency of the earthquakes increases with the increase of the tide; with three kinds of tidal curve ( the north-south， east-west component of the tidal force and tidal body stress ) ，the pS of the Schuster's test for all the earthquakes are 10. 52% ，2. 40% and 2. 06% ，and the pp of Permutation test are 10. 90% ， 2. 40% and 2. 06% ． The results of pS and pp based on the east-west component of the tidal force and tidal body stress are below the threshold of tidal triggering of earthquakes 0. 05． In the monthly scale，both the pS and pp are very low ( close to 0 ) ，far below the threshold of tidal triggering of earthquakes 0. 05，and the predominant tidal phase of the earthquake is － 18. 95°， close to the maximum 0° ( new moon and full moon) of the earth tide in monthly scale． With the statistical test of tidal triggering of the earthquake，we preliminary explained why the trigger effect in east-west direction is greater than that in north-south direction．