  We analyze the cross-correlation function between the soft and hard X-rays of
atoll source 4U 1735-44 with RXTE data, and find the anti-correlated soft and
hard time lags of about hecto-second. On the island state, the observations do
not show any obvious correlations, and most observations of banana branch show
positive correlation. However, the anti-correlations are detected on the upper
banana branch. These results are different from those of Z sources (Cyg X-2, GX
5-1), where the anti-correlation is detected in the low luminosity states, then
the lag timescales of both this atoll and Z sources are found to be similar, at
the magnitude of several tens to hundreds of seconds. As a comparison, it is
noted that the anti-correlated lags of thousand-second have been reported from
the several black hole candidates in their intermediate states. Finally, we
compare the correspondent results of atoll source 4U 1735-44 with those
observed in black hole candidates and Z sources, and the possible origins of
the anti-correlated time lags are discussed.
