If your surveillance system is composed of a network camera, there are generally three ways to watch the video: 1. Directly enter the domain name or IP address of the network camera through the IE browser to open the surveillance screen; 2. You can use the management software that comes with the camera to install it on your computer and then add cameras for monitoring and management; 3. You can use your mobile phone to install mobile phone management software for monitoring. This netizen gave a very detailed answer. Then I will add the brands: Hikvision, Lanchi, Dahua, Netview, D-LINK are all common brands on the market.