The time to learn plumbers mainly depends on learning speed, learning methods and practical opportunities. The training time of plumbers is usually 15 to 35 days, or 2 months. The study time at school is generally 2 months, but some people can master the technology of hydropower in about half a year. Learning plumber needs two parts: theory and practice. The theoretical part includes the introduction of plumbers, the quick introduction of plumbers, the operating rules of maintenance electricians and the operating rules of electrical safety.