{\singlespacing
\begin{enumerate}
\item[1.1] The Tur\'an Graph $T_{n, p}$ \dotfill 3
\item[1.2] $K_{t-2}+\overline{K}_{n-t+2}$ \dotfill 4
\item[2.1] Saturation graphs for $K_4-e$\dotfill 9
\item[2.2] Tree structure of 2-connected $(K_4-e)$-saturated graphs with $\delta(G)=2$ \dotfill 13
\item[2.3] Construction of $(K_4-e)$-saturated graphs with $m\in [2n-4, 3n-9]$ \dotfill 16
\item[2.4] Construction of $(K_4-e)$-saturated graphs with $m\in [3n-9, 4n-18]$ \dotfill 18
\item[2.5] (a) Blow-up of $C_5$; (b) Construction of $(K_4-e)$-saturated graphs \dotfill 20
\item[2.6] Another Construction of $(K_4-e)$-saturated graphs \dotfill 22
\item[3.1] (a) $K_4+\overline{K}_{n-4}$; (b) $K_{{\cln}{\fln}}$ \dotfill 27
\item[3.2] Tree structure of 2-connected $F_2$-saturated graphs with $\delta(G)=2$ \dotfill 30
\item[3.3] (a) Blow-up of $C_5$; (b) General construction of $F_2$-saturated graphs \dotfill 35
\item[3.4] Construction of $F_3$-saturated graphs \dotfill 37
\item[3.5] An $F_3$-saturated graph with $m=3n-6$ \dotfill 39
\item[3.6] Construction of $F_4$-saturated graphs \dotfill 40
\item[3.7] Another construction of $F_4$-saturated graphs \dotfill 42
\item[3.8] (a) Upper bound for $sat(n, F_t)$; (b) Lower bound for $sat(n, F_t)$ \dotfill 43
\item[3.9] (a) Construction of $F_t$-saturated graphs; (b) Example of $\hat{C}$ for $n=5$ \dotfill 45
\item[3.10](a) Construction;(b) Example $C'$ for $n=5$; (c) Example $C'$ for $n=6$ \dotfill 47
\item[4.1] A book graph, $B_p$\dotfill 49
\item[4.2] A Construction of $B_3$-saturated graphs \dotfill 50
\end{enumerate}}