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Let $X$ be a minimal projective 3-fold of general type. The pluricanonicalsection index $\delta(X)$ is defined to be the minimal integer $m$ so that$P_{m}(X)\geq 2$. According to Chen-Chen, one has either $1\leq \delta(X)\leq15$ or $\delta(X)=18$. This note aims to intensively study those with maximalsuch index. A direct corollary is that the $57$th canonical map of everyminimal 3-fold of general type is stably birational.

On minimal 3-folds of general type with maximal pluricanonical section index