Abstract: Agricultural science and technology is a key factor to promote growth of agricultural economy，and it is also an important source of improving innovation ability of agriculture.With attention of state to agriculture，investment of agricultural science and technology is continuously increased，the progress and innovation of agricultural science and technology are promoted，and modernization of agriculture in China is promoted.Meanwhile，how to optimize and improve existing agricultural technology structure and input，ensure efficiency of agricultural science and technology and promote the growth of agricultural economy are the focus of current research.From perspective of agricultural technology input，relationship between technology input and economic growth was analyzed，and its internal mechanism was studied empirically，Aiming at finding out problems，and then formulating measures and methods to optimize technology input.