The risk of mountain outdoor sports in the new development stage mainly includes human safety risk, environmental safety risk, equipment safety risk, physical skill safety risk and social environment safety risk. The factors leading to the risk of mountain outdoor sports in the new development stage are as follows: first, participants lack risk awareness and organizers lack scientific risk identification ability; The second is the unforeseeable risk caused by the uncertainty of the natural environment; Third, the lack of related outdoor sports professional knowledge and self-protection consciousness is weak and poor physical quality; Fourth, risk accidents caused by unreasonable design, unqualified quality and non-compliance with project requirements of equipment and equipment; Fifth, inadequate supply of laws and regulations, imperfect emergency rescue system and lack of safety education. In order to effectively control the risk of mountain outdoor sports in the new development stage, it is necessary to build a risk management community with everyone’s responsibility, responsibility and enjoyment under the premise of adhering to the concept of people’s life safety. First, to improve the mountain outdoor sports laws and regulations, promote the risk of the new development stage of the rule of law; Second, we should scientifically and reasonably improve the ability to identify risks and improve the risk early warning and prevention system. Thirdly, relevant professional knowledge should be popularized for effective training to improve the quality of participants; Fourth, to improve the industry supervision system, standardize equipment standardization; Fifth, we need to give play to the role of diverse entities and build a pattern of diverse and cogovernance.