Tourism, airline, hotel are industries those can be affected much by environment and social risks. Vietnam hotel, entertainment, airline & tourism industries are growing fast and contributing much to the economic development and have been affected by inflation. This paper measures the volatility of market risk in Viet Nam Hotel, entertainment, airline & tourism industries after this low inflation environment (2015-2017). The main reason is the necessary role of these financial companies and their system in Vietnam in the economic development and growth in recent years always go with risk potential and risk control policies. This research paper aims to figure out how much increase or decrease in the market risk of Vietnam Hotel, entertainment, airline & tourism firms during the post-low inflation environment 2015-2017. First, by using quantitative combined with comparative data analysis method, we find out the risk level measured by equity beta mean values in the Hotel, entertainment, airline & tourism industries are acceptable, as they are lower than (