前316年，秦惠文王派司馬錯滅蜀國，以張若為蜀國守。張若主持修築成都城和郫城、臨邛城。張若在蜀地三十餘年，輔佐了三代蜀侯公子通、蜀侯煇，公孫綰，三代蜀侯都獲罪被殺，只有張若居官如故。秦昭襄王殺死公孫綰後，不立蜀侯，專以蜀守張若治蜀。後張若東征楚國，得到巫郡和江南之地，作為秦的黔中郡。
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