Abstract: Li F (Mg. Cu. P) detector with its dispersion less than 3% was selected and put into the shell of personal dosimeter and placed in different monitoring site in the time period of 10 days to test the thermoluminescence cumulative dose. The results showed that there was a good linear correlation between the measured results and the placement time. The slope of the linear regression equation was the average dose rate of the placement point. TLD cumulative dose monitoring was simple and feasible,the results of TLD cumulative dose monitoring in different time periods could reflect the change of environmental dose in one time period.