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We have developed a high-strength Ta-reinforced conductor for high-magnetic-field magnets. In our previous work, it was demonstrated that the Ta-reinforced conductor had good characteristics against mechanical stress and strain. In this study, we made a 2-D calculation code for a stress-strain analysis, and derived the stress and strain of the magnet using some physical values such as the Young's modulus of the conductors, magnet dimensions and so on. According to the calculation results of some model magnets, the Ta-reinforced conductor could be used without extra support structures. Hence, the conductors are fit for high-magnetic-field and large-scale magnets such as NMR and SMES magnets.