With the development of the ultra-high voltage（UHV）power grid，the trans-regional interconnection grid pattern is gradually shaping，which will develop from local balance to overall balance.The physically interconnected grid provides a carrier for the long distance mutual aid trans-regional and transprovincial trading.To effectively bring global optimization into play，reduce energy loss and electricity purchase cost，the smart grid supporting trans-regional and transprovincial trading control technology is proposed.Based on the supply chain method，group control theory，risk management theory and cost management theory，the trans-regional and transprovincial trading control indicator system is constructed by analyzing the pivotal physical and economic characteristics.And then，the process of the pre-trading space control，the mid-process control，execution control and post-trading evaluation control are formed.Finally，the control technology application is achieved by setting up the trading control platform.It can be seen from verification on the control platform that this method is able to promptly monitor the trans-regional and transprovincial trading state via an analysis of the data flow，information flow and electricity flow，and reduce the trading cost，safeguard the trading’s rationality and compliance by optimizing the trading path and identifying the trading risk，promoting electricity trading’s quick，accurate and intelligent decisions.