  Let $\{f_n:n\in\mathbb{N}\}$ be a $J$-frame for a Krein space
${\textbf{\textit{K}}}$ and $P_M$ be a $J$-orthogonal projection from
${\textbf{\textit{K}}}$ onto a subspace $M$. In this article we find sufficient
conditions under which $\{P_M(f_n):n\in\mathbb{N}\}$ is a $J$-frame for
$P_M\textbf{\textit{K}}$ and $\{(I-P_M)f_n\}_{n\in{\mathbb{N}}}$ is a $J$-frame
for $(I-P_M)\textbf{\textit{K}}$. We also introduce $J$-frame sequence for a
Krein space ${\textbf{\textit{K}}}$ and study some properties of $J$-frame
sequence analogues to Hilbert space frame theory.
