The dynamical charge structure factor N(Q,omega) with Q smaller than the Fe
rmi wave number is derived analytically for the one-dimensional supersymmet
ric t-J model with 1/r(2) interaction. Strong spin-charge separation in dyn
amics is found. N(Q,omega) which a given electron density does not depend o
n the spin polarization of a system with an arbitrary size, In the thermody
namic limit, only two holons and one antiholon contribute to N(Q,omega). Th
ese results together with generalized ones for the SU(K,1) supersymmetric t
-J model are derived via solution of the Sutherland model in the strong cou
pling limit.