Abstract:The technology locking effect poses rigid constraints on the transformation in high-carbon industry.It is the key point to understand the causes of technology lock from perspective of conversion costs,so the process of unlock will be successful. Based on this view,the paper constructs the model of factor input locking effect ,analyzing the relationships between technical locking effects and conversion costs which includes system disintegrates costs,technical reconstruction costs and expected risk costs. The research shows that the main reason why technology lock effects in high-carbon industry are difficult to break is the barrier role of conversion costs. In order to solve the problem,more emphasis must be put on the high-carbon industry system reconstruction, technology innovation and fiscal policy.