Abstract: The immersed subbundles of free bundles and the immersed free subbundles of any module bundles are constructed,by using theoretics of tensor and module algebra.It is indicated that any module bundles can becomes a immersed subbundles of free bundles,and that there is a free bundles(or projective bundles) is a immersed subbundles of any module bundles also.In particular,the condition which projective bundles change into free bundles is given.