In this paper, we first discuss about canonical dual of g -frame LP={LiPÎB(H, Hi): iÎI}, where L={LiÎB(H, Hi): iÎI} is a g -frame for a Hilbert space H and P is the orthogonal projection from H onto a closed subspace M. Next, we prove that, if L={LiÎB (H, Hi): iÎI} and Q={QiÎB (K, Hi): iÎI} be respective g -frames for non zero Hilbert spaces H and K, and L and Q are unitarily equivalent (similar), then L and can not be weakly disjoint. On the other hand, we study dilation property for g -frames and we show that two g -frames for a Hilbert space have dilation property, if they are disjoint, or they are similar, or one of them is similar to a dual g -frame of another one. We also prove that a family of g -frames for a Hilbert space has dilation property, if all the members in that family have the same deficiency.