By analyzing on relationship between different communication distance and RSSI changes

choose the optimal communication distance which meets the positioning requirements. The RSSI-based equal-arc trilateral layout is used

to ensure that motion tracks of nodes to be test are always kept within the optimal communication distance of beacon nodes

so as to improve measurement precision of localization algorithm. A conclusion is drawn that equal-arc trilateral layout than the traditional square layout

traditional triangle layout and the improved triangle layout

the average positioning precision is increased by 81 %

54 %

48 %

respectively. Compared with the traditional triangle layout

equal-arc layout area coverage rate is increased by 23 %. This algorithm is simple calculation and no extended hardware are required and the cost is relatively low.