  We present a study of the structure and kinematics of the triple-shell
planetary nebula NGC 7662 based on long-slit echelle spectroscopic observations
and HST archival narrow-band images. The structure of NGC 7662 main nebula
consists of a central cavity surrounded by two concentric shells. The bright
inner shell has a non-negligible thickness and the highest density in the
nebula. The outer shell is filled with nebular material whose density profile
shows a propto 1/r drop-off in the inner regions of the shell and flattens in
the outermost regions. Both the inner and the outer shells can be described as
prolate ellipsoids: the inner shell is more elongated, while the outermost
layer of the outer shell expands faster. The physical structure of NGC 7662 is
qualitatively consistent with the predictions of hydrodynamical simulations
based on the interacting-stellar-wind models for planetary nebulae with a 0.605
solar mass central star. Models with a higher AGB wind velocity are needed for
detailed comparisons.
