The purpose of this study is to improve the heat economy of generator-unit boiler feed pump (BFP) drive and promote the driving effect of BFP. To this end, this paper studies the heat economy of generator’s BFP drive. A large-scale coal-fired thermal power generating unit was taken as an example. Then, with reference to the current situation of each link in the feed pump drive chain, modern driving technology was applied, and the mathematical model of the drive scheme was established using the fixed flow analysis method to perform the calculation for specific case. The study found that for the BFP of the 600MW unit, the net powers are sorted by size in the following: traditional electric pump scheme < steam pump scheme < high-efficiency fluid coupling scheme < frequency conversion scheme < spindle scheme. Therefore, among the five drive schemes, the spindle drive scheme has the least links in the energy transfer process, so its heat economy is the best.