Based on the principle of radio frequency（ RF） signal strength ranging

an indoor localization scheme is designed by using CC1101 chip. In the measuring region

a plurality of positioning module is set

a positioning module will be any three measurements and the K target module distance using three edge measuring method to calculate the K target module coordinates

all the K target module coordinates are average to obtain average coordinates

and screen three groups of data which has the minimum the average coordinate error

further average to obtain K target module coordinates. The method improves the positioning precision and alleviates the damage of individual target modules and the decrease of measurement precision caused by target beyond effective measurement distance. Experimental results show that the method is suitable for indoor large number of targets positioning.