Aiming at the requirement of separating the rule-of-law metering function from the rule-of-law metering function in R46 international proposal, this paper introduces the relevant requirements in R46 international proposal, and details the existing two-core metering scheme, single-core Dual-nuclear metering scheme and split-type metering scheme in the industry. Analysis and comparison. On this basis, a new generation of smart watt-hour meter design scheme is proposed, which is composed of base meter, main control board and module. By dividing the functions, the scheme has better realized the independence of measurement function and is compatible with the current measurement automation system architecture. With flexible modular design, it is easy to replace and upgrade, and can meet the needs of future power business applications.