Since 2001, Taiwan's economy has continued to decline alongside increased unemployment; only government expenditure has exhibited a clear upward trend. This study investigated the factors impacting on economic growth and two-way or one-way causality of the interaction influence. In addition, this study examined the problems of decision dimensions in Taiwanese government spending and economic growth. The study applied extenics by using the variables of statistical tests to identify the most crucial or influential control variable. To obtain an objective assessment, we determined data from significant estimates to determine the most crucial control factor. We obtained a successful result in this study.