Abstract: As an important indicator to measure performance of agricultural machinery，reliability is not only related to usage state of agricultural machinery，but also to reputation and development of agricultural machinery manufacturing enterprises.How to ensure reliability of agricultural machinery has become key problem to be solved in current agricultural machinery industry in China.Based on actual situation of agricultural machinery manufacturing enterprises in China，implementation process of reliability assurance system of agricultural machinery manufacturing enterprises in China was discussed from aspects of establishment of reliability assurance system，reliability assurance of agricultural machinery R&D，reliability assurance of purchased parts，reliability driven assembly process and reliability assurance of after-sale of agricultural machinery.Research results have important instruction significance for improving reliability level of agricultural machinery in China.