A dual-band triangular microstrip antenna is presented for Beidou navigation, applying spiral-slot arrays coupling technique. The antenna’s radiation patch is designed on a single layer of medium loaded with 6-elements feed coupling slot arrays. Thus, the actual current path could be controlled and the size of the proposed antenna is reduced effectively. Dual- band radiation is realized by introducing two triangular vortex rings coupled with 6 meandering slots, covering 1.616 GHz and 2.492 GHz. The three meandering slots are introduced on the ground plane to improve the antenna performance further. The simulation results show that the 10 dB impedance working bandwidths are 17 MHz and 35 MHz respectively for lower and higher frequencies of Beidou navigation, with quite good radiation stability and high gain performances.