With the development of the Internet, professionals in different industries or specialized areas have an increasing need forinformation exchange and social support. Therefore, industry or specialized web portals present a new opportunity in theInternet business. This paper presents a growth model for industry web portals. The model contains five stages: preparationstage, attraction stage, contagion stage, entrenchment stage, and defense stage. The model also gives the actions andstrategies to be taken and used in each stage. An industry web portal for engineering supervision, testing, and inspectionprofessionals in China is analyzed. This paper contributes to the industry web portals practice by a set of guidelines that canbe applied by practitioners in the industry web portals business.