The critical temperature of a uniform interacting Bose gas is shown to be increased by the repulsive interaction in the frame work of meanfield approximation, which has been regarded by many authors to be useless for studying the shift of the critical point. Furthermore, the critical temperature of a Bose gas with the general dispersion εp = cpk is also increased by the repulsive interaction between quasiparticles. The critical temperature of a trapped gas is also estimated in the same meanfield approximation. The present results agree qualitatively with those obtained perturbationally by other authors.