Two pairs of devices (PtP)are used at same location,but in different frequency.Is there any interference?
Depends on TX-power , spectral mask , frequency spacing and attenuation between antenna.
Each pair is setted Maxpower,and frequency is 5180Mhz and 5825Mhz ,when I use chariot test rate,between them interfere with each other
What is the physical distance between them?
They are together
We have 802.11a items all over the place located quite close together but maybe you should try putting some distance (even 0.5m or 1m if possible) between them.