Photometric observations of the W UMa binary NSVS 2569022 are presented .
The light curve solution reveals that both components are of F spectral type ( temperatures T _ { 1 } = T _ { 2 } =6100 K ) .
NSVS 254037 undergoes total eclipse of W subtype and the mass ratio is well-determined .
Its exclusive small value of only 0.077 implies that the target probably goes to instability and possible merger .
This value ranks NSVS 2569022 in sixth place among the binaries with smallest mass ratio .
On the base of empirical relation ” period – total mass ” for low mass-ratio binaries we estimated the global parameters of NSVS 2569022 : masses M _ { 1 } =1.17 M _ { \odot } and M _ { 2 } =0.09 M _ { \odot } ; radii R _ { 1 } =1.19 R _ { \odot } and R _ { 2 } =0.38 R _ { \odot } ; luminosities L _ { 1 } =1.73 L _ { \odot } and L _ { 2 } =0.17 L _ { \odot } .
An analysis of the characteristics of binaries with extremely low-mass ratios is made .
NSVS 2569022 turns out peculiar binary among the W UMa stars with extremely small mass ratios due to its unexpected small fill-out factor of only 0.014 ( slightly overcontact configuration ) .