In this paper,the inclusion of Musielak-Orlicz spaces is proved,which is a generalization of the inclusion of Orlicz spaces.Due to the fact that a variable exponent space is a special case of the Musielak-Orlicz space,we can obtain the equivalent relations of inclusion conditions between the spaces Lp(·)and Lq(·).At the same time,we get the inclusion of weighted Orlicz spaces.In addition,we also prove the inclusion of weak Musielak-Orlicz spaces,which is a generalization of weak variable exponent spaces.As applications,the equivalent relations of inclusion conditions between weak variable exponent spaces wLp(·)and wLq(·)and the inclusion of weak Orlicz spaces are established.