We consider weighted Bergman spaces and radial derivatives on the spaces. We also prove that for each element f in B$^$p, r/ there is a unique f in B$^$p, r/ such that f is the radial derivative of f and for each f$in$B$^$r/(i), f is the radial derivative of some element of B$^$r/(i) if and only if, lim f(tz)= 0 for all z$in$H.