  ZTF J153932.16+502738.8 (ZTFJ1539) is an eclipsing double-white-dwarf system
with an orbital period of 6.91 minutes, and is a significant source of LISA
detecting gravitational wave. However, the massive white dwarf (WD) with mass
of about 0.61 M$_\odot$ has a high effective temperature (48900 K), and the
lower mass WD with mass of about 0.21 M$_{\odot}$ has a low effective
temperature($<$10000 K). It is challenging the popular theory of binary
evolution. We investigate the formation of ZTFJ1539 via nova and Algol
scenarios. Assuming that the massive WD in ZTFJ1539 just experiences a
thermalnuclear runaway, nova scenario can explain the effective temperatures of
two WDs in ZTFJ1539. However, in order to enlarging a semi-detached orbit of
about 4---5 minutes to a detached orbit of about 7 minutes, nova scenario needs
a much high kick velocity of about 200 km s$^{-1}$ during nova eruption. The
high kick velocity can result in high eccentricity of about 0.2---0.6. Algol
scenario can also produce ZTFJ1539 if we take a high efficient parameter for
ejecting common envelope and enhance the mass-loss rate via stellar wind
trigger by tidal effect.
