With the further development of power market deregulation in China, competition in retail market is becoming increasingly fierce, which has enhanced the importance of retail pack-age design. Under the background of many provinces constructingelectricity market, it is feasible to carry out real-time - price retailpackage. Although fixed price and time - of-use packages are morewidely used, real-time price packages enjoy advantages of reflectingthe variation of electrical energy’s value and leading power consumption. On the basis of demand elasticity, a nonlinear optimization model for real time price packages is formulated, with properlydesigning the real-time price packages from the perspective of maxi-mizing the retailer’s profit and minimizing the gap of peak - valleyload. A realistic case study has been conducted, and the numericalresults show that real-time price packages can take the interests of electric power seller, consumers and power grid enterprises into consideration, so as to release the bonus of the reformation of electricpower system in China.