The close binary V337 Aql consists of two early B-type components with an orbital period of 2.7339 d. New multi-band photometric observations of the system together with published radial velocities enabled us to derive the absolute parameters of the components .
The simultaneous light and radial velocity curves solution yields masses and radii of M _ { 1 } =17.44 \pm 0.31 M _ { \odot } and R _ { 1 } =9.86 \pm 0.06 R _ { \odot } for the primary and M _ { 2 } =7.83 \pm 0.18 M _ { \odot } and R _ { 2 } =7.48 \pm 0.04 R _ { \odot } for the secondary component .
Derived fundamental parameters allow us to calculate the photometric distance as 1355 \pm 160 pc .
The present analysis indicates that the system is a near-contact semi-detached binary , in which a primary star is inside its Roche lobe with a filling ratio of 92 percent and the secondary star fills its Roche lobe .
From O-C data analysis , an orbital period decrease was determined with a rate of -7.6 \times 10 ^ { -8 } yr ^ { -1 } .
Kinematic analysis reveals that V337 Aql has a circular orbit in the Galaxy and belongs to a young thin-disc population .