Abstract: Business weather service market in US is highly open and prosperous. There are more than 200 companies supplying business weather service. Among them, the Weather Company (TWC) and AccuWeather are the top ones, owning the largest market share, and most advanced technology and service system. Based on massive, high-resolution meteorological prediction data, they provide both general daily weather information and special in-depth forecast service to industrial and economic customers. TWC has a series of special and powerful IT and meteorological systems to support their business weather service, including Forecast on Demand (FoD), high-resolution Numerical Weather Prediction system, Big Data Analysis system, and graph and video production and broadcasting system. TWC shows great capability of capital operation in its development process. Meanwhile, AccuWeather focuses on the application of meteorological data and the expertise. It owns unique high-resolution weather forecast system, warning production and delivery system, minute by minute forecast system, and graph and video interactive touching system. In the high segmentation of business weather service market, TWC and Accuweather have built up their own competitiveness and all-in-one service system.