The listed companies of plant industry and its processing industries play an important role in modern agricultural development. Based on economic performance influencing factors of plant industry and its processing industries and on annual report data of 28 listed companies, through computation model analysis, the results show that share-holding proportion of the former five biggest shareholders, total asset rotation rate, and tax subsidies have the most obvious influence on economic performance, that liabilities level has obvious influence and that the proportion of share-holding of the first biggest shareholder is negatively related to economic performance. Thus, this paper points out that agricultural listed companies should enhance company management, strengthen innovation ability, and create good external development environment.